1∶50 000 Geological Map Database of the Dongliumafang Map-sheet at the Junction of Shanxi, Hebei and Inner Mongolia
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摘要:
东六马坊幅(K50E023002)位于晋冀蒙交界地区的恒山—桑干高压麻粒岩带内，属华北克拉通典型的早前寒武纪高级变质岩区。东六马坊幅1∶50 000地质图数据库按照中国地质调查局新颁布的《区域地质调查技术要求(1∶50 000)》(DD 2019-01)和行业其他统一标准及要求，采用现代变质岩区填图技术方法和数字填图采集系统编制完成。该图幅对区内新太古代—新生代地层、岩浆岩、变质作用以及构造等进行了详细的划分厘定：建立了新太古代桑干岩群和古元古代集宁岩群4个构造–岩石地层单位以及中元古代—新生代13个地层单位；建立了新太古代—古元古代和中元古代—中生代(变质)侵入岩演化序列；识别出早前寒武纪3期变形构造样式和中—新生代印支期、燕山期和喜马拉雅期断裂构造形迹；识别出2类不同原岩性质的高压基性麻粒岩，并对变质作用期次进行了划分。图幅采用特殊线段及花纹表达了古老造山带深部地壳岩石塑性流变特征及构造变形样式，重塑了古元古代造山构造演化过程。该数据库为MapGIS格式，数据内容主要由1∶50 000地质图库、图饰部分及角图等组成，并包含9个锆石U–Pb年龄数据，数据量为53.8 MB。东六马坊幅1∶50 000地质图创新了高级变质岩区填图和图面表达方法，为高级变质岩区填图工作提供了参考范例。
Abstract:The Dongliumafang Map-sheet (K50E023002) is located in the Hengshan-Sanggan high-pressure granulite belt at the junction of Shanxi, Hebei and Inner Mongolia. The 1∶50 000 Geological Map Spatial Database of Dongliumafang Map-sheet was compiled in accordance with the Technical Requirement for Regional Geological Survey (1∶50 000) (DD 2019−01) newly issued by China Geological Survey and other relevant uniform standards and requirements, by using modern mapping technology for metamorphic rock area and digital mapping acquisition system. The map-sheet gave a detailed definition of the strata, magmatic rocks, metamorphism and tectonic structure in the Neoarchean-Cenozoic era in the area: four tectonic-lithostratigraphic units of the Neoarchean Sanggan Group and the Paleoproterozoic Jining Group, and 13 Mesoproterozoic-Cenozoic stratigraphic units have been established; the evolutionary series of Neoarchean-Paleoproterozoic and Mesoproterozoic-Mesozoic (metamorphic) intrusive rocks have been established; the structural deformation style of three periods of Early Precambrian, and the fracture structure in the Mesozoic-Cenozoic Indosinian, Yanshanian and Himalayan periods have been identified; two types of high-pressure basic granulites with different protolith properties have been identified, with metamorphic periods divided. The map-sheet uses special line segments and patterns to express the plastic rheological characteristics and structural deformation style of deep crustal rocks in the ancient orogenic belt, and has reconstructed the evolution process of Paleoproterozoic orogenic tectonics. The database adopts a MapGIS format and comprises 1∶50 000 geological map library, map appearance and corner maps, and contains nine data pieces of zircon U-Pb age, with a data volume of 53.8 MB. The 1∶50 000 Geological Map of Dongliumafang Map-sheet has innovated the mapping techniques for high-grade metamorphic areas as well as map expression methods, setting an example for mapping work on high-grade metamorphic rock areas.
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图 1 华北克拉通古元古代构造区划图(a，据Zhao GC et al., 2005修改)和晋冀蒙交界地区早前寒武纪地质简图(b)
表 1 数据库(集)元数据简表
条目 描述 数据库(集)名称 晋冀蒙交界东六马坊幅1∶50 000地质图空间数据库 数据库(集)作者 张家辉，中国地质调查局天津地质调查中心
王惠初，中国地质调查局天津地质调查中心
田 辉，中国地质调查局天津地质调查中心
任云伟，中国地质调查局天津地质调查中心
杨济远，河北省区域地质调查院数据时间范围 2016—2018年 地理区域 经纬度：东经114°15′～114°30′，北纬40°10′～40°20′ 数据格式 *.wl, *.wp, *.wt 数据量 53.8 MB 数据服务系统网址 http://dcc.cgs.gov.cn 基金项目 中国地质调查局地质调查项目“燕山—太行成矿带丰宁和天镇地区地质矿产调查”(DD20160042)资助 语种 中文 数据库(集)组成 该数据库(集)主要由1∶50 000地质图库、图饰部分及角图等组成。地质图包括沉积岩、岩浆岩、变质岩、第四系、脉岩、构造、地质界线、产状、样品、照片、同位素年龄、岩性柱、填图单位等。图饰部分包括沉积岩综合柱状图、图切地质剖面图、图例、接图表、责任栏等，角图包括构造–岩石地层单位柱状图、侵入岩演化序列表柱状图、构造纲要图、高压基性麻粒岩及P–T轨迹图、变质相划分图、古元古代构造演化模式图、调查区大地构造位置图、图名、中国地质调查局局徽、比例尺等 
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表 2 东六马坊幅地质图地质体面实体属性表
序号 数据项名称 标准编码 数据类型 实例 1 地质体面实体标识号 FEATURE_ID 字符串 AK50E023002000003234 2 地质体面实体类型代码(地质代码) FEATURE_TYPE 字符串 Jx1g1 3 地质体面实体名称 GEOBODY_NAME 字符串 蓟县系下统高于庄组一段 4 地质体面实体时代 GEOBODY_ERA 字符串 Jx1
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表 3 东六马坊幅地质图地质界线属性表
序号 数据项名称 标准编码 数据类型 实例 1 要素标识号 FEATURE_ID 字符串 AK50E023002000005998 2 地质界线(接触)代码(地质代码) FEATURE_TYPE 字符串 11 3 地质界线类型 BOUNDARY_NAME 字符串 侵入接触 4 界线左侧地质代号或上盘 LEFT_UNIT_CODE 字符串 Pt1N2 5 界线右侧地质代号或下盘 RIGHT_UNIT_CODE 字符串 βμPt2 6 界面走向/° STRIKE 整数型 280 7 界面倾向/° DIP_DIRECTION 整数型 10 8 界线倾角/° DIP_ANGLE 整数型 36
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表 4 东六马坊幅地质图产状属性表
序号 数据项名称 标准编码 数据类型 实例 1 要素标识号 FEATURE_ID 字符串 AK50E023002000001878 2 产状类型名称代码 FEATURE_TYPE 字符串 3 3 产状类型名称 ATTITUDE_NAME 字符串 片麻理产状 4 走向/° STRIKE 整数型 60 5 倾向/° DIP_DIRECTION 整数型 330 6 倾角/° DIP_ANGLE 整数型 45
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表 5 东六马坊幅地质图样品属性表
序号 数据项名称 标准编码 数据类型 实例 1 要素标识号 FEATURE_ID 字符串 AK50E023002000000241 2 样品编号 SAMPLE_CODE 字符串 D9001_1 3 样品类型代码 FEATURE_TYPE 字符串 b 4 样品类型名称 SAMPLE_NAME 字符串 b薄片 5 样品岩石名称 ROCK_NAME 字符串 灰黑色中细粒角闪斜长二辉麻粒岩
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表 6 东六马坊幅地质图照片属性表
序号 数据项名称 标准编码 数据类型 实例 1 要素标识号 FEATURE_ID 字符串 AK50E023002000003309 2 照片编号 SOURCE_ID 字符串 D7603_2 3 照片题目 SAMPLE_CODE 字符串 白云岩、紫红页岩互层 4 照片说明 PHOTO_TITLE 字符串 大红峪组岩组岩石组合宏观地质特征
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表 7 东六马坊幅地质图同位素年龄属性表
序号 数据项名称 标准编码 数据类型 实例 1 要素标识号 FEATURE_ID 字符串 AK50E023002000000001 2 样品编号 SAMPLE_CODE 字符串 TW8040_1 3 样品名称 SAMPLE_NAME 字符串 灰黑色中细粒二辉磁铁石英岩 4 年龄测定方法 MEASURING_KINDS 字符串 锆石U–Pb 5 测定年龄 AGE 字符串 2480±24Ma(D)/1847±15Ma(M) 6 被测定出地质体单位及代号 GEOBODY_CODE 字符串 Ar@3y.$ibr 7 测定分析单位 UNIT 字符串 天津地质调查中心同位素实验室 8 测定分析日期 DATE 字符串 20171114 注：@表示下标；$表示上标。
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表 8 东六马坊幅地质图河、湖、海、水岸线属性表
序号 数据项名称 标准编码 数据类型 实例 1 要素标识号 FEATURE_ID 字符串 AK50E023002000000021 2 图元类型 FEATURE_TYPE 字符串 21010 3 图元名称 FEATURE_NAME 字符串 常年河
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表 9 东六马坊幅地质图建造–构造图层属性表
序号 数据项名称 标准编码 数据类型 实例 1 要素标识号 Feature_Id 字符串 AK50E023002000002742 2 变质相带地质体代码 Feature_Type 字符串 Ar3gnγδο 3 变质相带类型 META_MORPHIC_TYPE 字符串 麻粒岩相 4 变质作用类型 META_TYPE 字符串 区域中高温变质作用 5 变质程度 META_DEGREE 字符串 高级 6 变质温压条件 TP_CONDITION 字符串 中压高温 7 变质相带岩石名称 ROCK_NAME 字符串 (黑云)英云闪长质片麻岩 8 变质相带岩石颜色 COLOR 字符串 灰白色、灰黄色 9 变质相带岩石结构 ROCK_TEXTURE 字符串 鳞片粒状变晶结构 10 变质相带变质构造 ROCK_STRUCTURE 字符串 片麻状或条带状构造 11 变质相带矿物组合及含量 ASSOCIATION 字符串 斜长石60%～65%，条纹长石不足5%，黑云母10%～16%
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表 10 东六马坊幅地质图标准图框属性表
序号 数据项名称 标准编码 数据类型 实例 1 图名 MAP_NAME 字符串 东六马坊 2 图幅代号 SHEET_CODE 字符串 K50E023002 3 比例尺 SCALE 字符串 50000 4 坐标系统 COORDINATE_SYSTEM 字符串 国家大地坐标系 5 高程系统 HEIGHT_SYSTEM 字符串 黄海高程系 6 左经度 LEFT_LONGITUDE 字符串 1141500 7 下纬度 LOW_LATITUDE 字符串 401000 8 图形单位 COORDINATES_UNIT 字符串 毫米
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表 11 晋冀蒙交界东六马坊幅区早前寒武纪变质表壳岩构造–地层单元划分
时代 构造岩石地层 代号 岩石组合 原岩性质 分布地区 产状 年龄/Ma 矿产 古
元
古
界集宁岩群 黄土窑岩组 含石墨–矽线–石榴片麻岩–变粒岩–大理岩岩段 Pt1h.ggm 含石墨矽线石榴钾长/二长片麻岩、含石墨矽线钾长变粒岩和透辉大理岩为主，局部夹石榴子石英岩、钙镁硅酸盐岩以及浅粒岩等 富黏土质长石砂岩建造，夹少量碳酸盐岩和石英砂岩 主要分布于周家山–朱家沟–史家庄一带、席麻沟–莲花石以及冷家沟–东减昌沟等地 带状构造岩片 碎屑锆石：1988～2300
变质锆石：1827～1837石墨矿 石榴高压麻粒岩–大理岩岩段 Pt1h.gm 高压基性麻粒岩、含石墨透辉/蛇纹石化大理岩、二辉斜长角闪岩等以及黑云矽线石榴二长片麻岩等 基岩火山岩夹碳酸盐岩(洋壳组合)，含少量碎屑岩 主要分布在西赵家窑 构造岩片 结晶年龄：>2026 新
太
古
界桑干岩群 阳高岩组 榴云片麻岩岩段 Ar3y.sg (条带状)石榴黑云斜长片麻岩为主，含石榴斜长变粒岩等 含黏土质杂砂岩建造 全区均有出露，主要分布在黑石山至团山村北一带 长条状、带状或透镜状 碎屑锆石：～2522
变质锆石:～2471;1831～1838二辉麻粒岩–铁英岩岩段 Ar3y.ibr 变基性岩(二辉麻粒岩)为主，夹条带状二辉磁铁石英岩，局部含石榴黑云斜长片麻岩 基性火山岩夹磁铁石英岩，含少量陆源碎屑岩 全区均有出露，分布广，规模小 透镜状，局部呈长条状 结晶年龄：～2489变质年龄：～1807 阿尔戈马型BIF铁矿
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表 12 天镇—怀安地区变质深成岩特征
时代 岩性 代号 构造层次 矿物组合 风化
外貌变质程度 锆石同位素年龄/Ma 产状 岩浆系列 构造背景 继承年龄 原岩年龄 变质年龄 古
元
古
代花岗伟晶岩 Pt1γρ 浅部 石英+斜长石+微斜长石+条纹长石±黑云母 肉红色 未变质 1809±9、
1797±14岩脉 高钾钙碱性系列 古元古代造山旋回 固结冷却 二长花岗岩脉 Pt1ηγ 中–浅部 石英+斜长石+条纹长石 肉红色 角闪岩相 2429～
24971844±17、1846±13 岩脉 碰撞抬升 二辉麻粒岩或二辉斜长麻粒岩 Pt1N2 中–深部 紫苏辉石+透辉石+斜长石+角闪石±黑云母 灰黑色 麻粒岩相–角闪岩相 ～1918(?) 1820±10、1834±9 岩墙或透镜体状 拉斑玄武岩系列 石榴角闪二辉麻粒岩 Pt1N1 深部 石榴子石+紫苏辉石+透辉石+斜长石+角闪石+磁铁矿±黑云母±石英 灰黑色 高压麻粒岩相–麻粒岩相–角闪岩相 2250～2200(?) 1957±23、1909±12、1836±18 岩墙、岩脉或布丁状、透镜体状 拉斑玄武岩系列 碰撞加厚 石榴花岗岩 Pt1gηγ 中–浅部 石英+斜长石+条纹长石+石榴子石±磁铁矿 肉红色 麻粒岩–角闪岩相 2031±21 1837±12 岩株 A型花岗岩 陆内裂解 新太古代末期 片麻状二长花岗岩 Ar3ηγ 中–浅部 石英+斜长石+条纹长石±黑云母 肉红色 角闪岩相 2472±10、
2486±21、
2448±91885～1833 岩株、岩脉 高钾钙碱性G2系列 新太古代克拉通化 岩浆弧 黑云二长花岗质片麻岩 Ar3gnβηγ 石英+斜长石+条纹长石+黑云母 肉红色 2440±30 变质边较窄 岩体 含紫苏奥长花岗质片麻岩 Ar3gnνγο 中部 石英+斜长石+紫苏辉石±角闪石+黑云母(暗色矿物≤5%) 灰白色 高角闪岩相–麻粒岩相 2492±18 变质边较窄 岩体，相互间为渐变过渡，协调的构造接触关系 DTT系列 (黑云)英云闪长质片麻岩 Ar3gnγδο 石英+斜长石+黑云母±紫苏辉石±角闪石 灰白色 2476±10、
2474±18、
2473±16、
2466±13、
2459±13变质边较窄 紫苏英云闪长质片麻岩 Ar3gnνγδο 中–深部 石英+斜长石+紫苏辉石±角闪石±黑云母 灰黑色 麻粒岩相 2497±25、～2525 1858±18 二辉石英闪长质片麻岩 Ar3gnψδο 石英+斜长石+紫苏辉石+透辉石±角闪石±黑云母 灰黑色 2480～2515 1822±42、1843±28
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表 13 天镇–怀安地区2类高压基性麻粒岩特征
时代 类型 岩性 填图单元 变质程度 原岩性质 年龄 产状关系 分布 古元古代 II类 高压基性麻粒岩 Pt1h.gm HT–HP麻粒岩相(峰期)、
麻粒岩相–角闪岩相(退变)基性火山岩 原岩年龄：2.15～2.2Ga(?)
变质年龄：1.82～1.83Ga与大理岩和变质泥–砂质碎屑岩伴生 在西赵家窑村一带出露 I类 Pt1N1 基性岩脉/墙、基性透镜体 原岩年龄：～2.2Ga(?)
变质年龄：～1957; 1850～1867Ma呈透镜状或似脉状产出于变质深成岩体之中 全区均有出露，分布广，规模小
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Table 1. Metadata Table of Database (Dataset)
Items Description Database (dataset) name 1∶50 000 Geological Map Database of the Dongliumafang Map-sheet at the Junction of Shanxi, Hebei and Inner Mongolia Database (dataset) authors Zhang Jiahui, Tianjin Center, China Geological Survey
Wang Huichu, Tianjin Center, China Geological Survey
Tian Hui, Tianjin Center, China Geological Survey
Ren Yunwei, Tianjin Center, China Geological Survey
Yang Jiyuan, Hebei Institute of Regional Geological SurveyData acquisition time 2016—2018 Geographic area 114°15′—114°30′ E, 40°10′—40°20′ N Data format *.wl, *.wp, *.wt* Data size 53.8 MB Data service system URL http://dcc.cgs.gov.cn Fund project China Geological Survey Project “Geological and Mineral Survey in Fengning and Tianzhen Areas of Yanshan-Taihang Metallogenic Belt” (DD20160042) Language Chinese Database (dataset) composition The database (dataset) is composed of 1∶50 000 geological map library, map appearance and corner maps. The geological maps include sedimentary rock, magmatic rock, metamorphic rock, Quaternary System, dike, tectonics, geological boundary, attitude, sample, photograph, isotopic age, lithologic column, and mapping unit. Map appearance includes the columnar section of sedimentary rock, cutting profile, legend, index map and duty table. Corner maps include columnar section of structural-lithostratigraphic unit, columnar section of intrusive rock evolution sequence table, structural outline map, high-pressure basic granulite and P–T path map, metamorphic facies division map, Paleoproterozoic tectonic evolution model map, geotectonic location map of the survey area, map name, emblem of the China Geological Survey, and scale
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Table 2. Attribute table of geological polygon in the geological map of Dongliumafang map-sheet
Serial number Data item Standard code Data type Examples 1 Geological polygon identification number FEATURE_ID String AK50E023002000003234 2 Geological polygon feature type (geological code) FEATURE_TYPE String Jx1g1 3 Geobody polygon name GEOBODY_NAME String 1st Member of Gaoyuzhuang Formation of Lower Jixian System 4 Geobody polygon era GEOBODY_ERA String Jx1
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Table 3. Attribute table of geological boundary in the geological map of Dongliumafang map-sheet
Serial Number Data item Standard code Data type Examples 1 Feature identification number FEATURE_ID String AK50E023002000005998 2 Geological boundary line (contact) code (geological code) FEATURE_TYPE String 11 3 Boundary name BOUNDARY_NAME String Intrusive contact 4 Code of geobody on the left side of the boundary or hangingwall LEFT_UNIT_CODE String Pt1N2 5 Code of geobody on the right side of the boundary or hangingwall RIGHT_UNIT_CODE String βμPt2 6 Strike/° STRIKE Integer 280 7 Dip direction/° DIP_DIRECTION Integer 10 8 Dip angle/° DIP_ANGLE Integer 36
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Table 4. Attribute table of attitude in the geological map of Dongliumafang map-sheet
Serial number Data item Standard code Data type Examples 1 Feature identification number FEATURE_ID String AK50E023002000001878 2 Attitude type code FEATURE_TYPE String 3 3 Attitude type name ATTITUDE_NAME String Gneissic foliation 4 Strike/° STRIKE Integer 60 5 Dip direction/° DIP_DIRECTION Integer 330 6 Dip angle/° DIP_ANGLE Integer 45
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Table 5. Attribute table of sample in the geological map of Dongliumafang map-sheet
Serial number Data item Standard code Data type Examples 1 Feature identification number FEATURE_ID String AK50E023002000000241 2 Sample code SAMPLE_CODE String D9001_1 3 Sample type code FEATURE_TYPE String b 4 Sample name SAMPLE_NAME String b Section 5 Rock name ROCK_NAME String Grey-black medium-fine-grained hornblende-plagioclase-pyroxene granulite
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Table 6. Attribute table of photograph in the geological map of Dongliumafang map-sheet
Serial number Data item Standard code Data type Examples 1 Feature identification number FEATURE_ID String AK50E023002000003309 2 Photograph code SOURCE_ID String D7603_2 3 Photograph title SAMPLE_CODE String Interbedded dolomite and purplish red shale 4 Photograph note PHOTO_TITLE String Macrogeological characteristics of rock association of Dahongyu Formation
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Table 7. Attribute table of isotopic age in the geological map of Dongliumafang map-sheet
Serial number Data item Standard code Data type Examples 1 Feature identification number FEATURE_ID String AK50E0230020 0000 0001 2 Sample code SAMPLE_CODE String TW8040_1 3 Sample name SAMPLE_NAME String Grey-white medium-fine-grained pyroxene–magnetite quartzite 4 Age measuring method MEASURING_KINDS String Zircon U–Pb 5 Age AGE String 2480±24 Ma(D)/1847±15 Ma(M) 6 Unit and code of measured geobody GEOBODY_CODE String Ar@3y.$ibr 7 Measuring and analysing unit UNIT String Isotope Laboratory of Tianjin Center, China Geological Survey 8 Measuring and analysing date FEATURE_ID String November 14, 2017 Note: @ indicates subscript; $ denotes superscript.
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Table 8. Attribute table of river-lake-sea-water coastline in the geological map of Dongliumafang map-sheet
Serial Number Data item Standard code Data type Examples 1 Feature identification number FEATURE_ID String AK50E023002000000021 2 Feature type FEATURE_TYPE String 21010 3 Feature name FEATURE_NAME String Perennial river
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Table 9. Attribute table of formation-structure layer in the geological map of Dongliumafang map-sheet
Serial Number Data item Standard code Data type Examples 1 Feature identification number Feature_Id String AK50E023002000002742 2 Geobody code in metamorphic facies zone Feature_Type String Ar3gnγδο 3 Metamorphic facies zone type META_MORPHIC_
TYPEString Granulite facies 4 Metamorphic type META_TYPE String Regional medium-high temperature metamorphism 5 Metamorphic degree META_DEGREE String High-grade 6 Metamorphic temperature-pressure conditions TP_CONDITION String Medium pressure and high temperature 7 Rock name of metamorphic facies zone ROCK_NAME (Biotite) tonalitic gneiss 8 Rock color of metamorphic facies zone COLOR Grey-white, grey-yellow 9 Rock texture of metamorphic facies zone ROCK_TEXTURE Lepido-granoblastic texture 10 Rock structure of metamorphic facies zone ROCK_STRUCTURE String Gneissic or banded structure 11 Mineral association and content of metamorphic facies zone ASSOCIATION 60%–65% plagioclase, less than 5% perthite and 10%–16% biotite
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Table 10. Attribute table of standard map frame in the geological map of Dongliumafang map-sheet
Serial Number Data item Standard code Data type Examples 1 Map name MAP_NAME String Dongliumafang 2 Sheet code SHEET_CODE String K50E023002 3 Scale SCALE String 50 000 4 Coordinate system COORDINATE_SYSTEM String China Geodetic Coordinate System 5 Height system HEIGHT_SYSTEM String Yellow Sea Height System 6 Left longitude LEFT_LONGITUDE String 1141500 7 Lower latitude LOW_LATITUDE String 401000 8 Coordinates unit COORDINATES_UNIT String mm
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Table 11. Tectonic-stratigraphic unit division of early Precambrian metamorphic supracrustal rocks in the Dongliumafang map-sheet area at the junction of Shanxi, Hebei and Inner Mongolia
Era Tectonic lithostratigraphy Code name Rock association Original rock property Distribution area Attitude Age/Ma Minerals Paleoproterozoic Jining Group Huangtuyao Formation Graphite-sillimanite-bearing garnet-biotite gneiss-leptynite-marble member Pt1h.ggm Dominated by graphite-sillimanite-garnet-bearing K-feldspar/monzonitic gneiss, graphite-sillimanite-bearing K-feldspar leptynite and diopside marble, with partially distributed garnet quartzite, calcium magnesium silicate rock and leucoleptite. Clay-rich feldspathic sandstone formation with a small amount of carbonate rock and quartz sandstone Mainly distributed in the Zhoujiashan-Zhujiagou-Shijiazhuang area, Ximagou-Lianhuashi and Lengjiagou-Dongjianchanggou Banded tectonic sheet Detrital zircon: 1988–2300; Metamorphic zircon: 1827–1837 Graphite ore Garnet high-pressure granulite-marble member Pt1h.gm High-pressure basic granulite, graphite-bearing diopside/serpentined marble, two-pyroxene amphibolite, biotite sillimanite garnet monzonite gneiss Bedrock volcanic rock mixed with carbonate rock (oceanic crust combination), containing small amounts of clastic rock Mainly distributed in Xizhaojiayao Tectonic slice Crystallization age:>2026 Neoarchean Sanggan Group Yanggao Formation Garnet-biotite gneiss member Ar3y.sg Mainly (banded) garnet biotite plagioclase gneiss, and garnet-bearing plagioclase granulite Clay-bearing sandstone formation With outcrops across the whole region, mainly distributed from Heishishan to the north of Tuanshan village Striped, banded or lenticular Detrital zircon:–2522; Metamorphic zircon:–2471;1831–1838 Two-pyroxene granulite-itabirite member Ar3y.ibr Dominated by meta-basic rocks (two-pyroxene granulite), intercalated with banded two-pyroxene magnet quartzite and partially containing garnet biotite plagioclase gneiss The basic volcanic rocks are mixed with magnet quartzite and contain a small amount of terrigenous clastic rocks With small-scale outcrops widely distributed across the whole region Lenticular, partially striped Crystallization age: ~2489; Metamorphic age:~1807 Algoma-type banded iron formation (BIF)
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Table 12. Characteristics of metamorphic plutonic rocks in Tianzhen-Huai'an area
Era Lithology Code name Structural hierarchy Mineral association Weathered appearance Degree of metamorphism Zircon Isotopic Age/Ma Attitude Magmatic series Tectonic setting Inherited
AgeProtolith
ageMetamorphic age Paleoproterozoic Granite pegmatite Pt1γρ Shallow part Quartz + plagioclase + microcline + perthite + biotite Meat red Not metamorphised 1809±9, 1797±14 Dike High-K calc-alkaline series Paleoproterozoic orogenic cycle Consolidation and cooling Adamellite dike Pt1ηγ Middle-Shallow Quartz + plagioclase + perthite Meat red Amphibolite facies 2429–2497 1844±17, 1846±13 Dike Collision and uplift Two-pyroxene granulite or two-pyroxene plagioclase granulite Pt1N2 Middle-Deep Hypersthene + diopside + plagioclase + hornblende + biotite Grey-black Granulite facies-amphibolite facies ~1918(?) 1820±10, 1834±9 Dike or lenticular Tholeiite series Garnet hornblende two-pyroxene granulite Pt1N1 Deep Garnet + hypersthene + diopside + plagioclase + hornblende + magnetite±biotite±quartz Grey-black High pressure granulite facies-granulite facies-amphibolite facies 2250–2200 (?) 1957±23, 1909±12, 1836±18 Dike or pudding-like, lenticular Tholeiite series Collision and thickening Garnet granite Pt1gηγ Middle-Shallow Quartz + plagioclase + microcline + perthite± magnetite Meat red Granulite-amphibolite facies 2031±21 1837±12 Stock A type granite Intracontinental cleavage Late stage of Neoarchean Gneissic adamellite Ar3ηγ Middle-Shallow Quartz + plagioclase + striped feldspar + biotite Meat red Amphibolite facies 2472±10, 2486±21, 2448±9 1885–1833 Stock, dike High-K calc-alkaline G2 series Neoarchean cratonization Magmatic arc Biotite monzonitic granitic gneiss Ar3gnβηγ Quartz + plagioclase + perthite + biotite Meat red 2440±30 Narrow metamorphic edge Rock mass Charnokite-bearing trondjemitic gneiss Ar3gnνγο Central Quartz + plagioclase + hypersthene±hornblende + biotite (dark mineral ≤5%) Grey-white High amphibolite facies-granulite facies 2492±18 Narrow metamorphic edge Gradual transition exists between rock masses, featuring smooth tectonic contact relation DTT Series Tonalite dioritic gneiss Ar3gnγδο Middle-Deep Quartz + plagioclase + biotite±hypersthene± hornblende Grey-white Granulite facies 2476±10, 2474±18, 2473±16, 2466±13, 2459±13 Narrow metamorphic edge Charnokite tonalite dioritic gneiss Ar3gnνγδο Quartz + plagioclase + hypersthene±hornblende±biotite Grey-black 2497±25,–2525 1858±18 Two-pyroxene quartz diorite gneiss Ar3gnψδο Quartz + plagioclase + hypersthene + diopside±hornblende±biotite Grey-black 2480–2515 1822±42,1843±28
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Table 13. Characteristics of two types of high-pressure basic granulites in Tianzhen-Huai'an area
Era Type Lithology Mapping Unit Metamorphic degree Protolith property Age Attitude relationship Distribution Paleoproterozoic Type II high-pressure basic granulite Pt1h.gm HT-HP granulite facies (peak period), granulite facies-amphibolite facies (retrogressive) Basic volcanic rock Protolith age: 2.15–2.2 Ga (?);Metamorphic age: 1.82–1.83 Ga Associated with marble and metamorphic argillaceous-sandy clastic rocks Exposed in the area of Xizhaojiayao village Type I Pt1N1 Mafic dike, basic lens ~2.2Ga(?)Metamorphic age: ~1957 Ma; 1850–1867 Ma Exists in metamorphic plutonic rock bodies in lenticular or vein-like form With small-scale outcrops widely distributed across the whole region
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