Early Paleoproterozoic Metallogenic Explosion in North China Craton
Early Paleoproterozoic Metallogenic Explosion in North China Craton
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DOI：
10.1007/978-981-10-1064-4_12
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发表时间：
2016
影响因子：
8
通讯作者：
Haoshu Tang;Yan‐jing Chen;K. Li;Weiyu Chen;Xiaoqing Zhu;Kunyue Ling;Xiaohui Sun
中科院分区：
文献类型：
--
作者：
Haoshu Tang;Yan‐jing Chen;K. Li;Weiyu Chen;Xiaoqing Zhu;Kunyue Ling;Xiaohui Sun
本章汇编了赋存于北中国克拉通和其他地区2.5万-1.8百万年镓矿床中的众多矿石的地质和年代学资料，其中包括石墨、磷矿、湖上型BIF、大理石、硼、菱镁矿和铅锌矿床，从而为理解北中国克拉通早古元古代成矿爆炸的成矿作用提供了见解。这些矿化记录伴随着生物光合作用的盛行(由石墨、磷矿沉积、黑色页岩中的有机物指示)，表明不同的矿化作用，它们响应了以大氧化事件(GOE)为特征的地球环境戏剧性变化的不同阶段。这些变化包括：早期水圈氧化作用(2.5-2.3AGa)，以大量发育的优势型生物圈为标志；通过2.29-2.25亿年Ga胡伦冰期事件指示的水圈到大气氧化(2.32.25亿年)的转折点，到大气氧化作用的晚期，然后是2.25-1.8亿年的厚层碳酸盐地层和相关矿床(如大理岩、菱镁矿、硼和铅锌矿床)的沉积，2.25-1.95亿年的Ga红层，2.22-2.06亿年的Gaδ13C正碳漂移(洛马迪/贾图利亚事件)，黑色页岩在2.0-1.7Ga盛行，BIF在1.8Ga左右消失。
This chapter compiles the geology and geochronology of numerous ores, including graphite, phosphorite, the Lake Superior type BIFs, marble, boron, magnesite, and lead-zinc deposits, hosted in 2.5–1.8 Ga stata from the North China Craton (NCC) and elsewhere, and thereby provides insights into understanding the mineralization of the early Paleoproterozoic metallogenic explosion in NCC. These mineralized records, accompanied with the blooms of biological photosynthesis (indicated by graphite, phosphorite deposits, organics in black shale), suggested different mineralizations, which responded to different stages of dramatic Earth’s environmental changes characteristic of the Great Oxidation Event (GOE). These changes includes that the early-stage hydrosphere oxidation (2.5–2.3 Ga), indicated by numerous development of the Lake Superior type BIFs; through the turnpoint from hydrosphere to atmosphere oxidation (2.3–2.25 Ga), indicated by the 2.29–2.25 Ga Huronnian Glaciation Event (HGE) and devoid of Rand-type Au–U deposits, to the late-stage atmospheric oxygenation, followed by 2.25–1.8 Ga sediments of thick-bedded carbonates strata and related deposits (e.g., marble, magnesite, boron, and lead-zinc deposits), the 2.25–1.95 Ga red beds, 2.22–2.06 Ga δ13Ccarbpositive excursion (Lomagundi/Jatulian Event), as well as the prevail of black shales at 2.0–1.7 Ga and disappear of BIFs at ca. 1.8 Ga.