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YingChao LIU ZengQian HOU ZhuSen YANG ShiHong TIAN TianNan YANG YuCai SONG HongRui ZHANG Emmanuel John M. CARRANZA 《Resource Geology》2011,61(4):384-406
The Dongmozhazhua deposit, the largest Pb–Zn deposit in south Qinghai, China, is stratabound, carbonate‐hosted and associated with epigenetic dolomitization and silicification of Lower–Middle Permian—Upper Triassic limestones in the hanging walls of a Cenozoic thrust fault system. The mineralization is localized in a Cenozoic thrust‐folded belt along the northeastern edge of the Tibetan plateau, which was formed due to the India–Asia plate collision during the early Tertiary. The deposit comprises 16 orebodies with variable thicknesses (1.5–26.3 m) and lengths (160–1820 m). The ores occur as dissemination, vein, and breccia cement. The main sulfide assemblage is sphalerite + galena + pyrite + marcasite ± chalcopyrite ± tetrahedrite, and gangue minerals consist mainly of calcite, dolomite, barite, and quartz. Samples of pre‐ to post‐ore stages calcite yielded δ13C and δ18O values that are, respectively, similar to and lower than those yielded by the host limestones, suggesting that the calcite formed from fluids derived from carbonate dissolution. Fluid inclusions in calcite and sphalerite in the polymetallic sulfidization stage mostly comprise liquid and gas phases at room temperature, with moderate homogenization temperatures (100–140°C) and high salinities (21–28 wt% NaCl eq.). Micro‐thermometric fluid inclusion data point to polysaline brines as ore‐forming fluids. The δD and δ18O values of ore fluids, cation compositions of fluid inclusions, and geological information suggest two main possible fluid sources, namely basinal brines and evaporated seawater. The fluid inclusion data and regional geology suggest that basinal brines derived from Tertiary basins located southeast of the Dongmozhazhua deposit migrated along deep detachment zones of the regional thrust system, leached substantial base metals from country rocks, and finally ascended along thrust faults at Dongmozhazhua. There, the base‐metal‐rich basinal brines mixed with bacterially‐reduced H2S‐bearing fluids derived from evaporated seawater preserved in the Permo–Triassic carbonate strata. The mixing of the two fluids resulted in Pb–Zn mineralization. The Dongmozhazhua Pb–Zn deposit has many characteristics that are similar to MVT Pb–Zn deposits worldwide. 相似文献
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Prasanta Kumar NAYAK Birendra Kumar MOHAPATRA Prem Prakash SINGH Ranjit Kumar MARTHA 《Resource Geology》2011,61(3):281-289
Banded iron formation (BIF) comprising high grade iron ore are exposed in Gorumahisani‐Sulaipat‐Badampahar belt in the east of North Orissa Craton, India. The ores are multiply deformed and metamorphosed to amphibolite facies. The mineral assemblage in the BIF comprises grunerite, magnetite/martite/goethite and quartz. Relict carbonate phases are sometimes noticed within thick iron mesobands. Grunerite crystals exhibit needles to fibrous lamellae and platy form or often sheaf‐like aggregates in linear and radial arrangement. Accicular grunerite also occur within intergranular space of magnetite/martite. Grunerite needles/accicules show higher reflectivity in chert mesoband and matching reflectance with that of adjacent magnetite/martite in iron mesoband. Some grunerite lamellae sinter into micron size magnetite platelets. This grunerite has high ferrous oxide and cobalt oxide content but is low in Mg‐ and Mn‐oxide compared to the ones, reported from BIFs, of Western Australia, Nigeria, France, USA and Quebec. The protolith of this BIF is considered to be carbonate containing sediments, with high concentrations of Fe and Si but lower contents of cobalt and chromium ± Mg, Mn and Ni. During submarine weathering quartz, sheet silicate (greenalite) and Fe‐Co‐Cr (Mg‐Mn‐Ni)‐carbonate solid solution were formed. At the outset of the regional metamorphic episode grunerite, euhedral magnetite and recrystalized quartz were developed. Magnetite was grown at the expense of carbonate and later martitized under post‐metamorphic conditions. With the increasing grade of metamorphism greenalite transformed to grunerite. 相似文献
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湘东北岳阳地区冷家溪群和板溪群凝灰岩
SHRIMP 锆石U-Pb年龄
——对武陵运动的制约 总被引:16,自引:3,他引:13
对冷家溪群及其上覆板溪群斑脱岩中的锆石进行研究,测得冷家溪群小木平组斑脱岩SHRIMP锆石U-Pb年龄(822Ma±10Ma)和上覆板溪群张家湾组斑脱岩锆石U-Pb年龄(802.6Ma±7.6Ma),结合“江南造山带”东部变质基底双桥山群和西南地区四堡群、下江群的SHRIMP锆石U-Pb年龄,将冷家溪群与其相应的江南古陆变质地层明确定位于新元古界。该年龄对重新界定“武陵运动”的时限和进行同期地层的区域对比、构造演化研究都有重要意义。冷家溪群与双桥山群、梵净山群、四堡群、双溪坞群一样,均为低变质绿片岩系,构成了江南古陆地区的变质基底。多年来冷家溪群一直划归中元古界,并且视为“武陵运动”的主体,其时代的定位将影响整个江南古陆变质基底的地层划分和对比,也将制约江南造山带的地质背景和成矿条件解疑。上述锆石U-Pb年龄不仅标示了湘东地区新元古代地层的时代,也为江南古陆中部变质基底提供了新的、精确的年代学数据。 相似文献
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藏南昂仁县桑桑地区林子宗群火山岩的形成时代
和地球化学特征 总被引:4,自引:1,他引:3
桑桑地区林子宗群火山岩Sr、Nd同位素地球化学特征和SHRIMP锆石U-Pb地质年代学数据表明:①林子宗火山岩以高钾流纹岩为主,属于高钾钙碱性系列岩石,形成于49.8Ma± 0.92 Ma,属于帕那组火山岩地层;②林子宗火山岩稀土元素配分模式较为一致,相对于HREE,强烈富集LREE;③林子宗火山岩具有相对低的初始Sr同位素值(87Sr/86Sr(i)=0.70488~0.70569)和较高的初始Nd值(εNd(i)=-1.38~-1.58);④总体上富集大离子亲石元素,亏损高场强元素,与岛弧型火山岩的地球化学特征类似。桑桑地区林子宗火山岩在形成过程中明显受到角闪石和斜长石分离结晶作用的影响。可能是俯冲的新特提斯洋板片断离或变陡,进而导致经历过俯冲交代作用的富集岩石圈地幔甚至局部下地壳发生部分熔融,形成的初始岩浆发生混合作用,并在近封闭条件下发生高度分离结晶作用的产物。结合已有的结果,认为冈底斯带南带普遍经历了50Ma左右的岩浆作用。 相似文献
89.
在近年来中亚造山带东段多金属矿床研究取得新进展的基础上,选择铀、钼两类矿床,结合铀、钼元素的地球化学行为探讨成矿物质来源的多样性和成矿的多阶段演化。此外,从构造研究角度,结合中亚造山带东段中大量中间地块存在的构造现象,讨论中间地块与成矿作用的关系:中间地块经历了从大陆边缘的裂解、漂移和板块碰撞造山作用,在漫长而复杂的地质过程中遭受的多次改造,有利成矿物质的反复被萃取和聚集。最后提出印支期华北克拉通北缘和北部造山带的成矿作用与底侵背景下的伸展作用密切相关。 相似文献
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