TitleCMF模式的排他性依据和造山型银矿实例:东秦岭铁炉坪银矿同位素地球化学
Other TitlesExclusive evidences for CMF model and a case of orogenic silver deposits: Isotope geochemistry of the Tieluping silver deposit, east Qinling orogen
Authors陈衍景
隋颖慧
Affiliation北京大学造山带与地壳演化实验室
北京大学地质学系
西澳大利亚地质调查所 北京 10087中国科学院地球化学研究所流体与深部物质研究室
贵阳 550002
北京 100871(现在美国普渡大学攻读学位)
10Plain Street
Perth
WA 600澳大利亚
Keywords铁炉坪造山型银矿
稳定同位素
秦岭造山带
CMF模式
排他性依据
Tieluping orogenic silver deposit
stable isotopes
Qinling Orogen
CMF model
exclusive evidence
Issue Date2003
Publisher岩石学报
Citation岩石学报.2003,(03),551-568.
Abstract河南熊耳山区的铁炉坪银矿定位于高级变质基底中的NE向断裂带中,是熊耳山脉状造山型金、银、铅锌矿床的重要组成部分。成矿作用包括了早、中、晚3个阶段,分别形成石英-黄铁矿,多金属硫化物和碳酸盐脉3类矿物组合。早阶段成 矿温度大约为373℃左右,成矿流体δD=-90‰,δ~(13)C_(co_2)=2.0‰,δ~(18)O=9‰,来源较深;晚阶段流体温度<203℃,δD=70‰,δ~(13)C_(co_2)=-1.3‰,δ~(18)O=-2‰,属于浅源大气降水热液;中阶段流体均一温度210~249℃,δD=-109‰,δ~(13)C_(co_2)=0.1‰,δ~(18)O=2‰,是深源与浅源流体的混...
The Tieluping silver deposit is a recently discovered Mesozoic orogenic-type Ag-Pb-Au deposit in East Qinling Orogen. Its ore formation includes three stages: early, middle and late, which include quartz-pyrite, polymetallic sulfides and carbonates, respectively. The early stage fluids are characterized by deltaD -90parts per thousand, delta(13) C-CO2 = 2.0parts per thousand and delta(18) O = 9parts per thousand at 373 degreesC, and are deeply sourced; the late stage fluids, with deltaD = -70parts per thousand, delta(13) C-CO2 = -1.3parts per thousand, delta(18) O = -2parts per thousand, are shallow-sourced meteoric water; whereas the middle stage fluids, with deltaD = -109parts per thousand, delta(13) C-CO2 = 0.1parts per thousand, delta(18) O = 2parts per thousand, are a mix of deep-sourced and shallow-sourced fluids. Comparisons of the D-O-C isotopic systematics of the early stage ore-forming fluids with the fluids derived from Mesozoic granites, Early Precambrian metamorphic basement and Mesoproterozoic Xionger Group, shows that these units cannot generate fluids with the isotopic composition (high delta(18) O and delta(13) C ratios and low deltaD ratios) characteristic of the ore-forming fluids. This suggests that the E-stage ore-forming fluids originated from metamorphic devolatilisation of a carbonate-shale-chert lithological association, locally rich in organic matter, of the Luanchuan and Guandaokou Groups. In addition, sulfur and lead isotope data show that the ore-forming fluids must originate from a source abundant with radiogenic lead and low delta(34) S, that differs significantly from geologic units in the Xiong'er Terrane, the lower crust and the mantle. This supports the view that the Luanchuan and Guandaokou Groups south of the Machaoying fault might be the favorable sources, although little is known about their isotopic compositions. A tectonic model for collisional orogeny, metallogeny and hydrothermal fluid flow is employed here to explain the formation of the Tieluping silver deposit. During the Mesozoic collision between the South and North China paleocontinents, a crustal slab containing a lithological association consisting of carbonate-shale-chert, locally rich in organic matter (carbonaceous shale) was subducted northwards beneath the Xiong'er Terrane along the Machaoying fault. Metamorphic devolatilisation of the underthrusted Luanchuan and Guandaokou Groups provided the ore-forming fluids to develop the Au-Ag-(Pb-Zn) ore belt, which includes the Tieluping silver deposit.
URIhttp://hdl.handle.net/20.500.11897/178075
ISSN1000-0569
DOI10.3321/j.issn:1000-0569.2003.03.022
IndexedSCI(E)
中文核心期刊要目总览(PKU)
中国科技核心期刊(ISTIC)
中国科学引文数据库(CSCD)
Appears in Collections:造山带与地壳演化教育部重点实验室
地球与空间科学学院

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