| 赣西北下寒武统观音堂组碳硅泥岩地球化学特征及其沉积环境演化 |
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| 引用本文： | 张万良,阙足双,高梦奇,吕川,黄超,黄迪,谢智聪.赣西北下寒武统观音堂组碳硅泥岩地球化学特征及其沉积环境演化[J].沉积学报,2019,37(2):278-291. |
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| 作者姓名： | 张万良 阙足双 高梦奇 吕川 黄超 黄迪 谢智聪 |
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| 作者单位： | 核工业二七〇研究所,南昌,330200;核工业二七〇研究所,南昌,330200;核工业二七〇研究所,南昌,330200;核工业二七〇研究所,南昌,330200;核工业二七〇研究所,南昌,330200;核工业二七〇研究所,南昌,330200;核工业二七〇研究所,南昌,330200 |
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| 基金项目： | 国家重点研发计划（2017YFC0602600） |
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| 摘 要： | 赣西北下寒武统黑色岩系,是一套重要的铀等金属的含矿岩系,其中观音堂组碳硅泥岩是典型的黑色岩石类型。运用地球化学方法,对这套灰黑色泥质岩的元素地球化学及古环境演变特征进行了研究。研究结果表明:该碳硅泥岩黏土类矿物含量55%～59%,SiO_2,Al_2O_3,Fe_2O_3,K_2O,MgO平均含量分别为69.47%,11.39%,3.32%,2.76%,1.57%;化学成分表现为高硅低铝低钾低镁特征,有机碳平均含量5.82%,属富碳黑色岩系。对比中国东部泥质岩,其Ni、V、U、Ba、Cd、In、Tl、Se、W、Mo、Cu、Zn、Au、Ag、As、Sb等元素有相对富集的特点。从碳硅泥岩层的上部到下部,SiO_2、Na_2O、Ni、Mo含量逐渐增高,Al_2O_3、K_2O、TiO_2、H_2O^-、LOI、Cr、Th、Ba、Ga、Li、Be、Rb、Sc、Sn、Bi、Cu、Pb、Zn、Ag、REE则显示逐渐降低趋势。主量或微量元素的判别参数或图解显示,碳硅泥岩的物源以陆源碎屑岩为主,是在一个沉积速率较小、且较稳定的深水还原环境下沉积的,从早期到晚期,物源区呈现风化作用逐渐增强、气候环境越来越湿润、盆地水质越来越淡化的趋势。
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| 关 键 词： | 碳硅泥岩 地球化学特征 古环境演变 早寒武世 赣西北地区 |
| 收稿时间： | 2018-01-10 |
Geochemical Characteristics and Sedimentary Environment Evolution of the Carbonaceous-Siliceous Mudstone of the Guanyintang Formation of the Lower Cambrian,Northwestern Jiangxi Province |
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| ZHANG WanLiang,QUE ZuShuang,GAO MengQi,L Chuan,HUANG Chao,HUANG Di,XIE ZhiCong.Geochemical Characteristics and Sedimentary Environment Evolution of the Carbonaceous-Siliceous Mudstone of the Guanyintang Formation of the Lower Cambrian,Northwestern Jiangxi Province[J].Acta Sedimentologica Sinica,2019,37(2):278-291. |
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| Authors: | ZHANG WanLiang QUE ZuShuang GAO MengQi L Chuan HUANG Chao HUANG Di XIE ZhiCong |
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| Institution: | No. 270 Research Institute of Nuclear Industry, Nanchang, 330200, China |
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| Abstract: | The black rock series of the Lower Cambrian in northwestern Jiangxi is an important source of uranium and other metals. The carbonaceous-siliceous mudstone of the Guanyintang Formation is a typical black rock type. This study of the element geochemistry and paleoenvironmental evolution characteristics of the carbonaceous-siliceous mudstone shows that the clay mineral content of the rock is 55%-59%, with average contents of SiO2 69.47%; Al2O3 11.39%; Fe2O3 3.32%; K2O 2.76%; MgO 1.57%; and TOC 5.82%. The chemical composition is characterized by high silicon, low aluminum, low potassium and low magnesium. It is rich in carbon. Comparison with the argillaceous rocks in eastern China shows that this carbonaceous-siliceous mudstone is relatively enriched in Ni, V, U, Ba, Cd, In, Tl, Se, W, Mo, Cu, Zn, Au, Ag, As, Sb and so on. From the upper to lower levels, SiO2, Na2O, Ni and Mo content increases gradually, and Al2O3, K2O, TiO2, H2O, LOI, Cr, Th, Ba, Ga, Li, Be, Rb, Sc, Sn, Bi, Cu, Pb, Zn, Ag and REE decrease gradually. The discriminant parameters or diagrams of the major or trace elements show that the source of the sedimentary material was terrigenous clastic rocks in a stable deep-water reducing environment and a low deposition rate. From early to late, the weathering effect of the source area has gradually been enhanced, the climate is becoming wetter, and the water in the basin is becoming increasingly desalinized. |
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| Keywords: | carbonaceous siliceous mudstone geochemical characteristics paleoenvironment evolution Early Cambrian northwest Jiangxi |
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