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首页> 外文期刊>Ore Geology Reviews: Journal for Comprehensive Studies of Ore Genesis and Ore Exploration >Geological, geochronological and geochemical constraints on the Tianhu iron deposit, Chinese Tianshan Orogen, NW China: A modified Algoma-type BIF deposit
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Geological, geochronological and geochemical constraints on the Tianhu iron deposit, Chinese Tianshan Orogen, NW China: A modified Algoma-type BIF deposit

机译：中国天山奥根根天山铁矿石地质，地质学和地球化学制约因素，NW中国：一种改性藻类型BIF沉积物

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The Tianhu large Fe deposit (104 Mt @ 42%) contains bedded- and lenticular-shaped orebodies hosted by the metamorphosed Neoproterozoic Tianhu Group in the Chinese Tianshan Orogen, NW China. In this study, an integrated geological, age and geochemical investigation was conducted to decipher whether the deposit belongs to the long debated BIF- or skarn-type. A newly-measured cross-section shows that the orebodies are stratiform, in intrusive contact with migmatite, and are divided into the upper, middle and lower units by faults. The well-preserved primary banded ores are hosted in the lower unit, while sulfide veins crosscut the banded formation in the middle and upper units, indicating pre-existing Fe-rich sediments modified by later sulfide-bearing magmatic-metamorphic fluids. Petrographic observation has identified a biotite-sphene-epidote-K-feldspar-plagioclase-ilmenite metamorphic mineral assemblage, whilst phase equilibrium simulation indicates that the ore-hosting Tianhu Group (with volcanic protoliths) were amphibolite-facies metamorphosed at 7.8-8.8 kbar and 605-635 degrees C. The Tianhu migmatite is newly zircon U-Pb dated to be Middle Ordovician (469.6 +/- 2.3 Ma and 469.3 +/- 1.7 Ma). Geochemical features of the Tianhu Fe ores, including low Al2O3, TiO2 and HFSEs and the poor correlations among them, coupled with the presence of positive Y and Eu anomalies, point to a mixed oreforming material source of high-temperature hydrothermal vent fluids and seawater. The negative Eu anomalies and REY patterns, atypical to BIFs, may have been derived from the sedimentary and hydrothermal apatite. The pyrite delta S-34 (-9.23 to +11.07 parts per thousand), Pb-206/Pb-204 (19.513-21.156), Pb-207/Pb-204 (15.691-15.764) and Pb-208/Pb-204 (38.655-39.136) indicate that the pyrite may have been of a mixed primary sedimentary and later hydrothermal origin. Based on the new geological, age and geochemical data, we conclude that the Tianhu Fe deposit is a Neoproterozoic Algoma-type BIF deposit modified by Ordovician magmatic-metamorphic events. (C) 2017 Elsevier B.V. All rights reserved.
机译：天湖大型费用（104吨@ 42％）含有由Met-alphosed Neoproterozoice Tianhu集团举办的床和透镜状的矿石，在中国天山Orogen，NW中国。在这项研究中，进行了综合地质，年龄和地球化学调查，以破译押金是否属于长期争论的BIF或Skarn型。一种新测量的横截面表明，矿体是层状的，侵入式接触Migmatite，并被故障分成上部，中间和下部单元。保存良好的初级带状矿石在下部单元中托管，而硫化物静脉在中间单元中交叉形成带状形成，表明通过后来耐硫化物岩浆变质流体改性预先存在的Fe沉积物。岩体观察已鉴定生物素 - 斯派 - ePIDOTE-K-feldspar-Plagioclase-Ilmenite变质矿物组合，而相平衡模拟表明矿物宿主天津（用火山促果实）在7.8-8.8 kbar和605-635摄氏度。天胡migmatite是新的锆石U-PB，曾经是中奥陶涅师（469.6 +/- 2.3 mA和469.3 +/- 1.7 ma）。天虎Fe Ores的地球化学特征，包括低Al 2 O 3，TiO2和HFSES以及它们之间的不良相关性，与阳性Y和Eu异常的存在相结合，指向高温热热通气流体和海水的混合鸢尾源。负面欧盟异常和rey模式，非典型为bifs，可能是源自沉积和水热磷灰石。黄铁矿三角形S-34（-9.23至+11.07份），PB-206 / PB-204（19.513-21.156），PB-207 / PB-204（15.691-15.764）和PB-208 / PB-204 （38.655-39.136）表明黄铁矿可能具有混合初级沉积和后来的水热源。基于新的地质，年龄和地球化学数据，我们得出结论，天湖Fe矿床是由奥陶语 - 变质事件修改的新月液杂志藻类型BIF矿床。 （c）2017 Elsevier B.v.保留所有权利。

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