Geological characteristics, magmatic geochemistry and petrogenic chronology of the Bagong Pb polymetallic ore spot in Ritu County, Tibet
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摘要:
巴工铅多金属矿位于西藏班公湖—怒江成矿带西部，构造单元归属于日土—多龙早白垩世岩浆弧带，初步估算Cu+Pb+Zn 3341资源量为9.49万t。本文以西藏日土埃永错东地区铜铅锌多金属矿产调查评价成果为基础，论述了日土县巴工铅多金属矿的地质特征，并对其成因、找矿意义等进行了初步讨论。通过大比例尺填图、系统采集稀土微量硅酸岩和同位素样品对其研究，查明矿点内出露的岩体有辉绿岩、石英二长闪长岩、花岗闪长斑岩和花岗斑岩，其中花岗闪长斑岩与成矿作用关系最为密切，形成环境为活动大陆边缘，时代为早白垩世（（112.7±0.68）Ma）；控矿因素主要有地层、构造、岩浆岩；成矿围岩主要为蚀变凝灰质砂岩、蚀变沉凝灰岩、蚀变辉绿岩和绢云绿泥蚀变岩；控矿构造为北西西向、近东西向和北西向断裂，矿体呈浸染状、透镜状、网脉状和集合体块状产出。初步认定巴工铜铅锌多金属矿成因为中低温热液裂隙充填型。该矿点的发现为班公湖—怒江结合带及两侧火山岩浆弧带这一有利成矿带提供了新的找矿线索，为该地区的找矿进一步拓宽了找矿方向。
Abstract:The Bagong Pb polymetallic ore spot is located in the west of the Bangong Co-Nujiang metallogenic belt, and its tectonic unit belongs to Ritu-Duolong early Cretaceous magma arc belt. Preliminary estimation of Cu+Pb+Zn 3341 resources is 94900 tons. Based on the results of investigation and evaluation of Cu-Pb-Zn polymetallic ore resources in the eastern Aiyongcuo area in Ritu County of Tibet, The authors investigated their geological characteristics, genesis and prospecting significance. Samples of rare earth elements, trace elements, silicate and isotopes were systematically collected and studied through large scale mapping, and the pluton which is exposed in the ore spot consists of diabase, quartz monzodiorite, granodiorite porphyry and granite porphyry. Among them, granule porphyry formed on active continental margin in early Cretaceous((112.7±0.68)Ma) seems to be most closely related to mineralization. The ore-controlling factors are mainly composed of strata, magma and structure. The metallogenic wall rocks mainly include altered tuff sandstone, altered agglomerate, altered diabase and sericite-chlorite altered rock. The ore-controlling structure mainly includes NWW-, nearly EW- and NW-trending faults. The orebody exhibits disseminated, lentoid, stockwork and aggregation forms. The authors preliminarily hold that the origin of the Bagong Cu-Pb-Zn polymetallic ore spot is of medium and low temperature hydrothermal fracture filling type. The discovery of this ore spot provides a new prospecting clue for BangongNujiang junction zone and the volcanic-magma arc on both sides of the junction zone. In addition, the prospecting direction is further expanded in this area.
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图 11 辉绿岩Ta/Yb-Th/Yb判别图解（a，据Pearce，1982）和Th-Hf-Ta判别图解（b，据Wood，1980）
Figure 11.
表 1 主要地质单元主要成矿元素含量（单位：Au、Hg为10-9，其他为10-6）
Table 1. Main metallogenic element content in major geological units(unit: Au and Hg: 10-9, other: 10-6)
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表 3 花岗闪长斑岩中的锆石 LA-ICP-MS U-Pb分析结果
Table 3. La-ICP-MS zircon U-Pb dating result of granodiorite porphyry
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表 4 矿区花岗闪长斑岩、辉绿岩主量元素（%）和微量元素（10-6）分析结果
Table 4. Major(%) and trace(10-6) element compositions of granodiorite porphyry, diabase
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