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| 贵州印江县铁厂村老堡组硅质岩地球化学特征及沉积环境探讨 |
| 赵志强1,贺同军1,孙小浩2,蔡柯柯1,樊杰1,王世伟3 |
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(1. 重庆市地质矿产勘查开发局607地质队, 重庆 400054;
2. 成都理工大学, 四川 成都 610059;
3. 重庆彭水苗族土家族自治县规划和自然资源局, 重庆 彭水 409600) |
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| 摘要: |
| 通过岩性组合特征和岩石地球化学分析，认为贵州印江县铁厂村老堡组硅质岩的沉积环境为台地边缘斜坡至台盆。硅质主要来源于陆源碎屑，不具热水沉积的特征。岩石地球化学特征研究表明，V/（V+Ni）值指示老堡组硅质岩形成于静海环境，受陆源的影响较大。δCe值和（La/Ce）N值表明老堡组硅质岩的沉积环境为开阔盆地和大陆边缘之间，构造背景为大陆边缘。 |
| 关键词: 硅质岩 地球化学 沉积环境 物质来源 |
| DOI： |
| 附件 |
| 投稿时间：2019-07-17修订日期：2019-08-12 |
| 基金项目:武陵山成矿带酉阳-天柱地区地质矿产调查（121201010000160904） |
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| Geochemistry and sedimentary environments of the siliceous rocks from the Sinian-Lower Cambrian Laobao Formation in Tiechang, Yinjiang, Guizhou: An approach |
| ZHAO Zhiqiang1, HE Tongjun1, SUN Xiaohao2, CAI Keke1, FAN Jie1, WANG Shiwei3 |
(1. No. 607 Geological Prospecting Party, Chongqing Bureau of Geology and Mineral Resources, Chongqing, 400054, China;
2. Chengdu University of Technology, Chengdu 610059, Sichuan, China;
3. Pengshui Bureau of Planning and Natural Resources, Pengshui 409600, Chongqing, China) |
| Abstract: |
| The sedimentary environments of the siliceous rocks from the Sinian-Lower Cambrian Laobao Formation in Tiechang, Yinjiang, Guizhou are classified, according to lithological associations and geochemical signatures, into the platform-margin to the platform basin sedimentary environments. The siliceous deposits are primarily derived from the terrigenous clastic deposits rather than the hydrothermal deposits. Geochemically, the V/(V + Ni) ratios suggest the euxinic environment for the formation of the siliceous rocks from the Laobao Formation. The Al/(Al + Fe + Mn) ratios and Al-Fe-Mn triangular diagram indicate that the terrigenous clastics have play an important part in the formation of the siliceous rocks. The Al2O3/(Al2O3 + Fe2O3) ratios and Al2O3/(Al2O3 + Fe2O3) versus Fe2O3/TiO2 diagrams indicate the continental marginal environment for the tectonic setting of the siliceous rocks from the Laobao Formation. The δCe values and (La/Ce)N values also show that the siliceous rocks from the Laobao Formation were formed in the sedimentary environments intermediate between the open basin and continental marginal environments. |
| Key words: siliceous rock geochemistry sedimentary environment origin |