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首页> 外文期刊>Journal of Asian earth sciences >Late Paleozoic SEDEX deposits in South China formed in a carbonate platform at the northern margin of Gondwana
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Late Paleozoic SEDEX deposits in South China formed in a carbonate platform at the northern margin of Gondwana

机译：华南晚古生代SEDEX矿床在冈瓦纳北缘的碳酸盐台地中形成

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摘要

SEDEX sulfide deposits hosted in black shale and carbonate are common in the South China Block. The Dajiangping pyrite deposit is the largest of these deposits and is made up of stratiform orebodies hosted in black shales. Sandstone interlayered with stratiform orebodies contains detrital zircon grains with the youngest ages of 429 Ma. Pyrite from the orebodies has a Re-Os isochron age of 389 +/- 62 Ma, indicative of formation of the hosting strata and syngenetic pyrite ores in the mid-late Devonian. The hosting strata is a transgression sequence in a passive margin and composed of carbonaceous limestone in the lower part and black shales in the upper part. The ore-hosting black shales have high TOC (total organic carbon), Mo, As, Pb, Zn and Cd, indicating an anoxic-euxinic deep basin origin. The high redox proxies, V/(V + Ni) 0.6 and V/Cr 1, and the positive correlations of TOC with Mo and V in black shales are also consistent with an anoxic depositional environment. The Dajiangping deposit is located close to the NE-trending Wuchuan-Sihui fault, which was active during the Devonian. The mid-late Devonian mineralization age and the anoxic-euxinic deep basinal condition of this deposit thus imply that the formation of this deposit was causally linked to hydrothermal fluid exhalation in an anoxic fault-bounded basin that developed in a carbonate platform of the South China Block. The regional distribution of many Devonian, stratiform, carbonaceous sediment-hosted sulfide deposits along the NE-trending fault-bounded basins in South China, similar to the Dajiangping deposit, indicates that these deposits formed at a basin developed in the passive margin setting of the South China Block during the Devonian. This environment was caused by the break-up and northward migration of the South China Block from Gandwana.
机译：黑泥页岩和碳酸盐岩中存在的SEDEX硫化物矿床在华南地区很常见。大江坪黄铁矿矿床是其中最大的矿床，由黑色页岩中的层状矿体组成。层状矿体夹层的砂岩中含有碎屑锆石，最年轻的年龄为429 Ma。矿体中的黄铁矿的Re-Os等时年龄为389 +/- 62 Ma，表明在泥盆纪中晚期形成了宿主地层和同质黄铁矿。宿主地层是一个被动边缘的海侵层序，由下部的碳质石灰石和上部的黑色页岩组成。含矿黑色页岩的总有机碳（TOC），钼，砷，铅，锌和镉的总有机碳含量较高，表明缺氧-富氧的深部盆地。 V /（V + Ni）> 0.6和V / Cr> 1以及在黑色页岩中TOC与Mo和V的正相关性也与缺氧沉积环境一致。大江坪矿床位于泥盆纪期间活跃的东北走向的吴川-四会断裂附近。因此，泥盆纪的中晚期成矿时代和该矿床的缺氧-富氧深盆地条件表明该矿床的形成与在华南碳酸盐岩平台上发育的缺氧断层界盆地中的热液呼出有因果关系。块。与大江坪沉积相似，华南NE向断裂带沿盆的泥盆纪，层状，含碳沉积物硫化物矿床的区域分布表明，这些矿床形成于该盆地被动缘发育的盆地。泥盆纪时期的华南地块。这种环境是由于华南地块从甘德瓦纳（Gandwana）的解体和向北迁移造成的。

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