Distribution, microfabric, and geochemical characteristics of siliceous rocks in central orogenic belt, China: implications for a hydrothermal sedimentation model.
Distribution, microfabric, and geochemical characteristics of siliceous rocks in central orogenic belt, China: implications for a hydrothermal sedimentation model.
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中国中央造山带硅质岩的分布、微结构和地球化学特征：对热液沉积模型的启示
DOI：
10.1155/2014/780910
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发表时间：
2014
影响因子：
--
通讯作者：
Voudouris PCh
中科院分区：
文献类型：
--
作者：
Li H;Zhai M;Zhang L;Gao L;Yang Z;Zhou Y;He J;Liang J;Zhou L;Voudouris PCh
海相硅质岩广泛分布于中国中央造山带，与地质演化和成矿作用密切相关。它们具有中元古代—侏罗系的周期性分布，中元古代、寒武—奥陶系和石炭—二叠纪为正峰，受拉张地质环境的影响，沉积作用增强。晋宁期、加里东期、海西期、印支期和燕山期的挤压作用使其分布急剧下降。八方山—二里河矿床的硅质岩主要有自生石英、同沉积金属硫化物和分散的碳酸盐矿物。SiO2（71.08 ~ 95.30%）、Ba （42.45 ~ 503.0 ppm）、ΣREE （3.28 ~ 19.75 ppm）均为热液沉积成因。Al/(Al + Fe + Mn)、Sc/Th、（La/Yb）N和（La/Ce）N比值及δCe值表明，所研究的硅质岩沉积于有限海洋的边缘海盆。认为八方山—二里河地区经历了高低温期热液活动。前一阶段热液沉积物以金属硫化物和二氧化硅为主，后一阶段热液沉积物以二氧化硅为主。尽管硅质岩存在热液沉积作用，但少量陆源输入、岩浆活动和生物活动导致地球化学特征偏离了典型的热液特征。
Marine siliceous rocks are widely distributed in the central orogenic belt (COB) of China and have a close connection to the geological evolution and metallogenesis. They display periodic distributions from Mesoproterozoic to Jurassic with positive peaks in the Mesoproterozoic, Cambrian—Ordovician, and Carboniferous—Permian and their deposition is enhanced by the tensional geological settings. The compressional regimes during the Jinning, Caledonian, Hercynian, Indosinian, and Yanshanian orogenies resulted in sudden descent in their distribution. The siliceous rocks of the Bafangshan-Erlihe ore deposit include authigenic quartz, syn-depositional metal sulphides, and scattered carbonate minerals. Their SiO2 content (71.08–95.30%), Ba (42.45–503.0 ppm), and ΣREE (3.28–19.75 ppm) suggest a hydrothermal sedimentation origin. As evidenced by the Al/(Al + Fe + Mn), Sc/Th, (La/Yb)N, and (La/Ce)N ratios and δCe values, the studied siliceous rocks were deposited in a marginal sea basin of a limited ocean. We suggest that the Bafangshan-Erlihe area experienced high- and low-temperature stages of hydrothermal activities. The hydrothermal sediments of the former stage include metal sulphides and silica, while the latter was mainly composed of silica. Despite the hydrothermal sedimentation of the siliceous rocks, minor terrigenous input, magmatism, and biological activity partly contributed to geochemical features deviating from the typical hydrothermal characteristics.
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影响因子：
2.8
作者：
ADACHI, M;YAMAMOTO, K;SUGISAKI, R
通讯作者：
SUGISAKI, R
影响因子：
5.3
作者：
Bernard, Sylvain;Benzerara, Karim;Goffe, Bruno
通讯作者：
Goffe, Bruno
影响因子：
3.5
作者：
Champagnon, B;Panczer, G;HumbertLabeaumaz, B
通讯作者：
HumbertLabeaumaz, B
影响因子：
2.8
作者：
BALTUCK, M
通讯作者：
BALTUCK, M
DOI：
10.1016/s1572-5480(07)01019-6
发表时间：
2007-01-01
期刊：
PROXIES IN LATE CENOZOIC PALEOCEANOGRAPHY
影响因子：
--
作者：
Calvert, Stephen E.;Pedersen, Thomas F.
通讯作者：
Pedersen, Thomas F.