Mineral chemistry of clinopyroxene from the Hongshan syenite complex in Wu'an, Hebei Province: Implications for magma evolution
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摘要:
洪山正长岩杂岩体发育较多的具有核-边（核-幔-边）结构的单斜辉石，通过研究单斜辉石成分的变化，可以获得岩石成因及演化信息。本文在详细野外地质调查的基础上，采用锆石U-Pb年代学、矿物学研究，获得洪山正长岩杂岩体内黑云辉石正长岩锆石U-Pb年龄为（126.9±1.2）Ma，是华北克拉通岩石圈减薄峰期的产物；洪山正长岩杂岩体内辉石正长岩与黑云辉石正长岩中单斜辉石Mg#值分别在39.4~72.5、55.4~81.7，具有较高FeO、Na2O、CaO含量，较低Al2O3、MgO、TiO2含量的特征；单斜辉石总体具有透辉石→霓石的演化趋势，并与熔体达到平衡状态，单斜辉石在初始演化时具有Fe2+对Mg2+的取代关系，随着演化的进行，岩浆更加富钠、富铁，反映了岩浆体系具有高温、中等氧逸度和富碱的特点。结合单斜辉石核-边（核-幔-边）具有截然的接触关系和不连续的化学组成，表明洪山正长岩杂岩体在形成后还经历了富钠、富铁流体的改造，致使单斜辉石形成了具有富钠、富铁的边部，流体可能是由西向东（或者由洪山正长岩杂岩体中部向外部）对杂岩体进行改造的。
Abstract:Hongshan syenite complex has fairly abundant clinopyroxene with core-rim (core-mantle-rim) structure. By studying the changes in the composition of clinopyroxene,information on the genesis and evolution of rocks can be obtained. Based on detailed field geological survey,the authors used zircon U-Pb chronology and mineralogical studies to obtain the biotite pyroxene syenite zircon U-Pb dating data of Hongshan syentite complex,with the age being(126.9±1.2)Ma,suggesting a product of the thinning peak period of the North China Craton lithosphere. The Mg# values of clinopyroxene from pyroxene syenite and biotite pyroxene syenite in the Hongshan syenite complex are 39.4-72.5 and 55.4-81.7,with characteristics of high FeO,Na2O and CaO content and low Al2O3,MgO and TiO2 content. The clinopyroxene generally had the evolutionary trend of diopside and aegirine,and reached an equilibrium state with the melt. The clinopyroxene had a Fe2+ to Mg2+ substitution relationship during the initial evolution. With the evolution,the magma became richer in sodium and iron,which suggests that the magma system had the characteristics of high temperature,medium oxygen fugacity and richness in alkali. Combined with the clinopyroxene core-rim (core-mantle-rim),the authors hold that there existed a clear contact relationship and discontinuous chemical composition. It is shown that,after the formation of the Hongshan syenite complex,it also underwent the transformation of sodium-rich and iron-rich fluids,causing the clinopyroxene to form a sodium-rich and iron-rich rim. The fluid may have modified the complex from west to east or from the inside of the Hongshan syenite complex to the outside.
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Key words:
- syenite complex /
- clinopyroxene /
- mineralogy /
- zircon U-Pb chronology /
- Mesozoic /
- magma evolution /
- sodium-rich fluid /
- geological survey engineering /
- Wu'an /
- Hebei Province
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1. 引言
位于华北克拉通中部带的邯邢地区发育大量的中生代基性—中酸性杂岩体，并盛产铁矿，前人在该地区作了大量的基础性研究和地质调查工作，并取得了丰硕的成果(罗照华等, 1999;许文良等, 2006, 2009; Chen et al., 2008; Deng et al., 2015;苏尚国等, 2017)，其中东部的洪山正长岩杂岩体仅发育规模较小的铜金矿化(李随民等, 2020)，总体研究程度相对较低。岩浆岩中造岩矿物的化学组成与岩浆的物质成分、矿物的结晶环境密切相关，这些特征的变化可以在矿物成分上直接表现出来，因此可以利用矿物成分的变化特征来深入探讨岩石成因及演化机制(Dobosi and Fodor, 1992; Yang et al., 1999；白志民，2000; Marks et al., 2004; Gao et al., 2004, 2008;蒋少涌等, 2006, 2008;黄小龙等, 2007;牛晓露等, 2009;邹金汐等, 2012;杨照耀等, 2015;刘鑫和汤艳杰, 2018)。鉴于此，本文在对邯邢地区东部洪山正长岩杂岩体进行详细野外地质调查的基础上，选择富含单斜辉石矿物的辉石正长岩和黑云辉石正长岩，运用详细的矿物学手段来研究岩石的性质和岩浆演化过程。
2. 地质背景和岩体地质
本文研究区位于华北克拉通中部带(图 1a)，区内出露地层主要为分布于西部的前寒武纪变质地层，向东逐渐过渡到白垩纪火山岩地层，缺失志留纪、泥盆纪、侏罗纪地层；岩体由西向东依次为符山角闪闪长岩杂岩体、武安二长岩杂岩体、洪山正长岩杂岩体(图 1b)。洪山正长岩杂岩体呈半圆形岩株状出露于永年区洪山沟一带的下二叠统—上三叠统，西侧部分受紫山—鼓山断裂切割下降后被第四系覆盖不可见，出露面积约53 km2 (张波等, 2020)，杂岩体的主体是由边缘相的黑云辉石正长岩、过渡相的辉石正长岩，逐渐过渡到中心相的正长岩(图 2)，边缘相向中心相表现为黑云母和辉石含量逐渐降低，矿物颗粒逐渐增大，杂岩体零星分布粗面岩、辉长岩、闪长玢岩，和广泛分布的正长斑岩脉、石英脉等(图 1b，图 2)。洪山正长岩杂岩体发育大量的断层(图 2)。本文研究对象为过渡相靠近中心相的辉石正长岩(HS8-33)和边缘相靠近过渡相的黑云辉石正长岩(HS8-48)，采样位置见图 2。
图 1. 华北克拉通基底构造单元划分图(a, 据Zhao et al., 2005)和邯邢地区区域地质图(b, 据资料❶, ❷修编)1—第四系；2—白垩纪火山岩地层；3—三叠纪沉积地层；4—二叠纪沉积地层；5—石炭纪沉积地层；6—奥陶纪沉积地层；7—前寒武变质地层；8—正长岩；9—二长岩；10—二长闪长岩；11—闪长岩；12—角闪闪长岩；13—橄榄辉长岩；14—辉橄岩Figure 1. Tectonic subdivision of the North China Craton (a, after Zhao et al., 2005) and geological map of the Handan-Xintai area (b, modified from Zhao et al., 2008❶; Zhang et al., 2014❷)1-Quaternary; 2-Cretaceous volcanic strata; 3- Triassic sedimentary strata; 4-Permian sedimentary strata; 5-Carboniferous sedimentary strata; 6-Ordovician sedimentary strata; 7-Precambrian metamorphic strata; 8-Syenite; 9-Monzonite; 10-Monzodiorite; 11-Diorite; 12-Hornblende diorite; 13-Olivine gabbro; 14-Pyroxene peridotite辉石正长岩为浅肉红色，粗粒半自形粒状结构，块状构造，主要由钾长石(70%)、辉石(10%)、斜长石(10%)、磷灰石(5%)、磁铁矿(3%)组成，含有少量榍石、锆石等，钾长石多为条纹长石，宽板状，发育卡式双晶，粒径约为3 mm×5 mm，发育钠长石增生边；辉石为单斜辉石，他形—半自形粒状，与磷灰石和磁铁矿共生，位于长石晶体间隙，粒径1 mm左右，部分辉石呈捕虏晶形式位于钾长石内，他形，粒径多小于0.2 mm；磷灰石呈自形—半自形粒状，与辉石共生，粒径0.3~1.0 mm；磁铁矿为立方体，位于辉石矿物颗粒间，粒径小于0.1 mm(图 3a、b)。
图 3. 洪山正长岩杂岩样品照片和镜下照片a, b—辉石正长岩(HS8-33)；c, d—黑云辉石正长岩(HS8-48). Cpx—单斜辉石；Kfs—钾长石；Ab—钠长石；Bt—黑云母Figure 3. Sample photos and microphotograph of the Hongshan syenite complexa, b-Pyroxene syenite (HS8-33); c, d-Biotite pyroxene syenite (HS8-48). Cpx-Clinopyroxene; Kfs-K-feldspar; Bt-Biotite黑云辉石正长岩为浅肉红色，中粗粒半自形粒状结构，块状构造，主要由钾长石(65%)、斜长石(15%)、辉石(10%)、黑云母(5%)、磷灰石(5%)组成，含有少量榍石、磁铁矿、锆石等，钾长石多为条纹长石，宽板状，发育卡式双晶，粒径1 mm×3 mm~3 mm×5 mm；斜长石他形-半自形粒状，发育聚片双晶，粒径0.5~1 mm，常被钾长石包裹；辉石为单斜辉石，他形—半自形粒状，与磷灰石和磁铁矿共生，位于钾长石晶体间隙，粒径1 mm左右，部分辉石呈早期捕虏晶形式位于钾长石内，他形，粒径多小于0.2 mm；黑云母片状，粒径2~3 mm，与辉石、磁铁矿等矿物共生；磷灰石自形-半自形粒状，与辉石共生，粒径0.3~ 1.0 mm；磁铁矿为立方体，位于辉石矿物颗粒间，粒径小于0.1 mm(图 3c、d)。
3. 分析方法
锆石分选及CL图像的采集在河北省区域地质矿产调查研究所实验室完成。首先将新鲜无蚀变的样品粉碎至80~100目，并用重液和磁选方法进行分离，最后在双目镜下提纯。将分选出的锆石颗粒黏在双面胶上，套上靶环，灌入环氧树脂后冷却，对样品靶抛光露出锆石颗粒表面，再对锆石进行透射光、反射光和阴极发光(CL)图像的采集。锆石LA-ICP-MS U-Pb年龄分析在北京锆年领航科技有限公司完成。将193 nm的ArF准分子激光与Elan 6100DRC型ICP-MS仪器连接，采用He作为剥蚀物质的载气，用美国国家标准技术研究院研制的人工合成硅酸盐玻璃标准参考物质NIST 610进行仪器最佳化，Si为内标元素，采用PLE锆石为标样进行U-Pb同位素的标定，91500标准锆石为监控盲样。本次实验所采用的激光束斑直径为30 μm，剥蚀频率为5 Hz，激光能量密度为20 J/cm2，普通铅校正采用Anderson (2002)的方法，其年龄采用Ludwig (2003)的Isoplot /Ex_ver 3. 0程序计算。详细实验测试过程可参见文献Yuan et al. (2004)。矿物的主量元素分析在河北省区域地质矿产调查研究所实验室的电子探针上完成，分析仪器型号为JXA-8230，加速电压15 kV，束流1×10-8A，束斑1~ 10 μm。采用PRZ方法校正，分析标样为美国SPI公司的53种矿物，测试精度优于1%。
4. 分析结果
4.1 锆石U-Pb年代学
本文在洪山正长岩杂岩体中黑云辉石正长岩采集1件样品进行锆石U-Pb年代学工作，采样位置为：36°44′45.8″N、114°25′52.8″E。本文锆石U-Pb测年样品代表性锆石CL图像见图 4a，U-Pb分析结果见表 1。
图 4. 洪山正长岩杂岩体代表性锆石的CL图像(a)和锆石U-Pb年龄谐和曲线(b)Figure 4. Representative cathodoluminescence (CL) images of zircon grains (a) and U-Pb concordia diagrams of zircons (b) from the Hongshan syenite complex表 1. 洪山正长岩杂岩体锆石LA-ICP-MS U-Pb年龄数据Table 1. LA-ICP-MS U-Pb zircon ages of Hongshan syenite complex
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从CL图像中可以看出，锆石基本均呈自形晶，内部结构清晰，多数锆石振荡生长环带发育。具有相对较高的Th/U比值(0.55~1.86)，暗示它们为岩浆成因。黑云辉石正长岩(HS8-48)中25颗锆石进行了25个点的测试分析，除其中10个测点数据较离散外，其余15个测点的206Pb/238U年龄介于123.9~ 132.3 Ma，在206Pb/238U-207Pb/235U谐和图上均落在谐和线上或其附近(图 4b)，206Pb/238U年龄加权平均值为(126.9±1.2)Ma(1σ，MSWD=1.07，n=15)。
4.2 辉石成分特征及分类
在背散射(BSE)图像中，可以清楚地发现单斜辉石(Cpx)具有复杂的结构特征，辉石正长岩(HS8- 33)中Cpx多发育核-边结构，表现为核部形状不规则、颜色较深，被颜色较浅、宽度较窄的边部包裹(图 5a、b)，核-边界线截然，以溶蚀的港湾状为主，以不发育明显环带为特征；而黑云辉石正长岩(HS8-48)中Cpx有的发育与辉石正长岩中Cpx类似的核-边结构，有的发育核-幔-边结构，核部发育形状不规则、颜色较浅的斑块区(Goleń, 2015)，幔部为颜色较深的主体Cpx，边部则发育颜色较浅的外带(图 5c、d)，核-幔-边界线同样截然，以溶蚀的港湾状为主，同样以不发育明显环带为特征。电子探针数据(表 2)表明，辉石正长岩和黑云辉石正长岩中Cpx的Mg#值分别在39.4~72.5、55.4~81.7，除一个Mg#值较高的点(图 5d，4- 10点)外，其SiAl2O2含量分别为51.00%~53.75%、50.89%~52.82%；O3含量分别为0.28% ~2.98%、0.99% ~2.40%；MgO含量分别为6.67%~12.93%、9.35%~13.16%；FeO*含量分别为8.74% ~18.27%、8.30% ~13.45%；CaO含量分别为17.74%~23.10%、21.22%~23.22%；Na2O含量分别为0.91% ~3.75%、0.80% ~1.77%；TiO2含量分别为0.10%~0.55%、0.12%~0.61%。总的来说，辉石正长岩和黑云辉石正长岩中Cpx均具有较高的FeO、Na2O、CaO含量，较低Al2O3、MgO、TiO2含量的特征，黑云辉石正长岩中Cpx主量元素的变化范围更小，辉石正长岩中Cpx核部和黑云辉石正长岩中Cpx幔部均具有较高的SiO2、TiO2、Al2O3、MgO、CaO含量和Mg#值。黑云辉石正长岩中Cpx而核部和边部具有几乎一致的主量元素含量特征(表 2，图 7)，通过仔细观察和对比，这种现象的产生很可能是由于边部Cpx呈枝状嵌入幔部Cpx，后来在样品加工过程中切割矿物造成的“捕虏晶”假象。
图 5. 洪山正长岩杂岩体中代表性单斜辉石的BSE图像a, b—辉石正长岩(HS8-33)；c, d—黑云辉石正长岩(HS8-48)；Cpx—单斜辉石；Kfs—钾长石；Amp—角闪石；Mt—磁铁矿Figure 5. Representative BSE images of the of clinopyroxene from the Hongshan syenite complexa, b-Pyroxene syenite (HS8-33); c, d-Biotite pyroxene syenite (HS8-48); Cpx-clinopyroxene; Kfs-K-feldspar; Amp-Amphibole; Mt-Magnetite
Wo—硅灰石; En—斜顽辉石; Fs—斜铁辉石; WEF—Wo-En-Fs端元; Jd—硬玉; Ae—霓石; 图b中演化趋势分别为: 1—钙铁辉石→透辉石(Baie-des-Moutons正长岩质杂岩体早期正长岩中，Lalonde and Marin, 1983); 2—透辉石→钙铁辉石(日本碱性玄武岩系列, Aoki, 1964; Shiant Isles岩体，Gibb, 1972); 3—透辉石→霓石(Shonkin Sag岩体, Nash and Wilkinson, 1970); 4—透辉石→易变辉石(日本拉斑质玄武岩，Kuno, 1955)Figure 6. Discrimination diagram of the series for pyroxene (a) and discrimination diagram of clinopyroxene (b, c) from the Hongshan syenite complex (modified from Morimoto, 1988; Qiu Jiaxiang and Liao Qun'an, 1996)Wo-Wollastonite; En-Clinoenstatite; Fs-Clinoferro; WEF-Wo-En-Fs end member; Jd-Jadeite; Ae-Aegirine; Fig. b shown for comparison exhibiting crystallization trends of other different types of magmas; 1- Hedenbergite → diopside (Baie -des- Moutons syenitic complex, early- group syenites. After Lalonde and Marin, 1983); 2- Diopside → hedenbergite (Japanese alkaline basalt series, after Aoki, 1964; Shiant lsles sill, Gibb, 1972); 3- Diopside → aegirine (Shonkin Sag laccolith, after Nash and Wilkinson, 1970); 4- Diopside → ferropigeonite (Japanese tholeiite series, after Kuno, 1955)
表 2. 洪山正长岩杂岩体中单斜辉石电子探针数据(%)Table 2. Electron microprobe analyses of clinopyroxene from Hongshan syenite complex (%)
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依据Morimoto(1988)提出的辉石分类命名方案，本文中的黑云辉石正长岩中Cpx均位于Q-J图解(Q=Ca+Mg+Fe2+, J=2Na+)的Ca-Mg-Fe区域内，且位置较为集中，而辉石正长岩中Cpx则横跨了Ca-Mg-Fe和Ca-Na区域，并表现为不连续的分组特征(图 6a)，主要表现为核部Cpx主要位于CaMg-Fe区域，而边部Cpx主要位于Ca-Na区域；将所有数据点投在Wo-En-Fs三角图中(图 6b)，所有Cpx几乎全部落入次透辉石和铁普通辉石区域；将所有数据点投在WEF-Jd-Ae三角图中(图 6c)，所有点均位于Ca-Mg-Fe和霓石-普通辉石区域。通过投图可以发现，黑云辉石正长岩中几乎所有Cpx (不论核部、幔部还是边部)均为Ca-Mg-Fe系列的次透辉石，辉石正长岩中Cpx核部均为Ca-Mg-Fe系列的次透辉石区域，而边部位于铁普通辉石和Ca-Na系列的霓石-普通辉石区域。
在单斜辉石Mg#值哈克图解上(图 7)，Mg#值与SiO2、TiO、Al2O3、MgO、CaO呈现出较好的正相关关系，与FeO*、MnO、Na2O则呈现出较好的负相关关系，与Cr2O3、K2O相关性不明显。除与Mg#值直接相关的FeO*和MgO外，其余与单斜辉石Mg#值相关性较好的几种氧化物中，辉石正长岩与黑云辉石正长岩中Cpx的趋势并不相同，表现为辉石正长岩中Cpx的核部与黑云辉石正长岩中Cpx的幔部具有一致的元素含量特征，并且变化范围较小，而辉石正长岩中Cpx的边部与黑云辉石正长岩中Cpx的核部、边部元素含量明显不同，并且变化范围较大。
单斜辉石及其与之平衡的熔体间Fe与Mg有[KD(Fe- Mg)Cpx- melt=(Fe/Mg)Cpx/(Fe/Mg)melt，其中Fe与Mg都是摩尔含量]的平衡公式，Putirka (2008)利用1245个实验观测值得到KD大致在0.04~0.68间的正态分布范围，平均值为0.28(1σ=0.08)，使用该标准在2σ=0.16时，可以得到KD在0.12~0.44的平衡区间(图 8)。本文所有测试点几乎位于KD=0.12~0.44范围内，说明单斜辉石与熔体已达平衡状态，不太可能存在捕虏晶的情况(Di et al., 2020)，结合单斜辉石具有清晰界线的核-边或者核-幔-边结构，可能是流体改造的结果。
Figure 8. Rhodes diagram for clinopyroxenes form the Hongshan syenite complex (modified from Rhodes et al., 1979; Di et al., 2020, symbols as for Fig. 6)5. 讨论
5.1 黑云辉石正长岩形成时代
黑云辉石正长岩中锆石CL图像显示其发育振荡环带，具有相对较高的Th/U比值，表现出了岩浆锆石的特征，其测定的年龄应该代表了岩浆的结晶年龄。黑云辉石正长岩的锆石206Pb/238U年龄分别为123.9~132.3 Ma，其加权平均年龄为(126.9±1.2) Ma (1σ，MSWD=1.07，n=15)，表明其形成时代为早白垩世，暗示了洪山正长岩杂岩体形成时代与华北克拉通岩石圈减薄的峰期年龄相一致(Zhai et al., 2004;吴福元等, 2008; Xu et al., 2009; Zhu et al., 2011, 2012a, b ; Zheng et al., 2018; Wang et al., 2018; Zhu and Xu, 2019)，并与华北克拉通其他中生代富碱性杂岩体形成时代一致(例如: Yan et al., 2000; Zhang et al., 2005;吴福元等, 2005;阎国翰等, 2007; Yang et al., 2009;陈春良等, 2014;段友强等, 2015;王亚莹等, 2015;霍腾飞等, 2016; Sun et al., 2019)。这一年龄与洪山正长岩杂岩体辉石正长岩年龄(125.6± 1.2)Ma(未发表数据)一致，并略早于辉石正长岩的形成年龄，其年龄的微小差异与洪山正长岩杂岩体相带分布特征吻合。
5.2 洪山正长岩杂岩体中单斜辉石结晶趋势及岩浆体系特征
洪山正长岩杂岩体中Cpx与Shonkin Sag岩体中Cpx类似，总体具有透辉石→霓石的演化趋势(图 6b)，但辉石正长岩Cpx核部、黑云辉石正长岩Cpx与河北矾山杂岩体中Cpx类似，均具有较高的CaO含量(牛晓露等, 2009)，其Ca/(Ca+Mg+Fe)分别介于46.1~51.7、48.2~52.1，比Shonkin Sag岩体的初始演化趋势高(图 6b, Nash and Wilkinson, 1970)，表现为Cpx具有更高的Ca2+含量，并具有次透辉石→铁次透辉石方向的近水平演化趋势，表明Cpx结晶早期，有Fe2+对Mg2+的取代关系；而辉石正长岩中Cpx边部在透辉石→霓石的演化趋势下方，暗示了此时Ca2+含量变低，更多地被Fe2+、Fe3+和Na+取代，说明岩浆是向更加富铁、钠的方向演化的(图 6)。这样的趋势反映了岩浆体系具有高温、中等氧逸度(Aoki, 1964; Gibb, 1973;邱家骧和廖群安, 1996)和富碱(尤其是富钠)的特点。
5.3 洪山正长岩杂岩体中单斜辉石的形成过程
大量研究表明，Cpx的成分主要受母岩浆的成分与结晶环境的制约(Le Bas, 1962;邱家骧和廖群安, 1996;白志民, 2000; Gao et al., 2008;牛晓露等, 2009, 2016; Chen et al., 2018;刘鑫和汤艳杰, 2018)，其成分可以很好地反映母岩浆的成分特征。通过观察黑云辉石正长岩与辉石正长岩中Cpx主量元素含量(表 2)，可以发现黑云辉石正长岩中Cpx幔部与辉石正长岩中Cpx核部具有较为一致的主量元素含量，结合Mg#值哈克图解(图 7)演化趋势，可以清楚地发现黑云辉石正长岩中Cpx幔部与辉石正长岩中Cpx核部集中在较小的范围变化(图 7a-c、f、h、i)，说明它们结晶过程中可能具有相同的母岩浆成分，并且结晶环境较为稳定，形成了差别较小、无环带特征的Cpx。
黑云辉石正长岩与辉石正长岩中Cpx的边部成分差异较大，说明了Cpx边部在结晶过程中，辉石正长岩与黑云辉石正长岩经历了不同的演化过程，表现为辉石正长岩中Cpx边部结晶时母岩浆更加富硅、铁、钠(图 7a、d、i)，贫钛、铝、锰、镁、钙(图 7b、c、f、g、h)，尤其以铁、钠含量差别明显(图 7d、i)，使得辉石正长岩中Cpx边部向霓石-普通辉石方向演化(图 6b、c)，结合采样位置(图 2)，辉石正长岩位于洪山正长岩杂岩体中部，靠近中心相的正长岩，而这里结晶相对较晚，反映了晚期岩浆残余成分演化的过程，随着结晶过程的进行，岩浆向着富铁、富碱的方向演化，这也表现在Cpx边缘发育较多的磁铁矿(图 5)，而仅仅通过岩浆演化，在连续的结晶过程中并不会形成Cpx核部与边部截然的接触关系(图 5)，辉石分类图解中辉石正长岩中Cpx核部与边部成分变化也是不连续的(图 6a、c)，Mg#值哈克图解和罗德图中同样反映了不连续的演化过程(图 7、图 8)，并且辉石正长岩中钾长石边缘发育钠长石反应边(图 3b)等特征，说明除了岩浆自身的演化外，洪山正长岩杂岩体中部还经历了一次富钠、富铁流体的作用，流体对辉石正长岩的作用强度明显大于对黑云辉石正长岩的作用强度(图 9)，说明富钠、富铁流体可能由西向东(或者由洪山正长岩杂岩体中部向外部)对杂岩体进行改造的。
Figure 9. Mg-Na-(Fe2++Mn) diagram for clinopyroxenes from the Hongshan syenite complex (modified from Eby et al., 1998, symbols as for Fig. 6)6. 结论
通过对洪山正长岩杂岩体野外调查研究，以及辉石正长岩、黑云辉石正长岩中单斜辉石、锆石LAICP-MS U-Pb年代学研究，可以得出以下结论：
（1）洪山正长岩杂岩体黑云辉石正长岩加权平均年龄分别为(126.9±1.2)Ma(1σ，MSWD=1.07，n= 15)，是早白垩世华北克拉通减薄峰期的产物。
（2）洪山正长岩杂岩体中单斜辉石总体具有透辉石→霓石的演化趋势, 初始演化时具有Fe2+对Mg2+的取代关系，随着演化的进行，岩浆更加富铁、富钠，反映了岩浆体系具有高温、中等氧逸度和富碱(尤其是富钠)的特点。
（3）洪山正长岩杂岩体形成后，可能受到了由西向东(或者由洪山正长岩杂岩体中部向外部)的富钠、富铁流体的改造。
注释
❶赵祯祥, 杜晋锋, 段春森. 2008.长治市幅J49C004004 1:25万区域地质调查报告[R].太原:山西省地质调查院.
❷张兆祎, 杨红宾, 徐永利, 靳松, 赵保强, 樊延恩, 王建武, 王克冰, 李锋, 孙阳, 胡建忠, 王健宇, 毕立. 2014.邯郸市幅J50C004001 1: 25万区域地质调查报告[R].石家庄:河北省地质调查院.
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图 1 华北克拉通基底构造单元划分图(a, 据Zhao et al., 2005)和邯邢地区区域地质图(b, 据资料❶, ❷修编)
Figure 1.
图 6 洪山正长岩杂岩体单斜辉石系列划分图解(a)和单斜辉石分类图解(b、c)(据Morimoto, 1988;邱家骧和廖群安, 1996修改)
Figure 6.
图 8 洪山正长岩杂岩体单斜辉石罗德图(据Rhodes et al., 1979; Di et al., 2020修改, 图例同图 6)
Figure 8.
图 9 洪山正长岩杂岩体单斜辉石Mg-Na-(Fe2++Mn)图解(据Eby et al., 1998修改, 图例同图 6)
Figure 9.
表 1 洪山正长岩杂岩体锆石LA-ICP-MS U-Pb年龄数据
Table 1. LA-ICP-MS U-Pb zircon ages of Hongshan syenite complex
下载: 导出CSV
表 2 洪山正长岩杂岩体中单斜辉石电子探针数据(%)
Table 2. Electron microprobe analyses of clinopyroxene from Hongshan syenite complex (%)
下载: 导出CSV
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