| 游军,张锋军,曹宏远,王洁明,蔡文春,李景晨,佘鹏涛.陕西中村—湘河地区下寒武统水沟口组硅质岩地球化学特征及其意义[J].矿产勘查,2018,9(1):12-21 |
| 陕西中村—湘河地区下寒武统水沟口组硅质岩地球化学特征及其意义 |
| Geochemical Characteristic and Significance of Silicolites from the Lower Cambrian Shuigoukou Formation in Zhongcun-Xianghe Area, Shaanxi |
| 投稿时间：2017-03-08 |
| DOI： |
| 中文关键词: 地球化学特征 硅质岩 水沟口组 中村—湘河地区 陕西 |
| 英文关键词: geochemical characteristics,silicalite,Shuigoukou Formation, Zhongcun-Xianghe area, Shaanxi Province |
| 基金项目:陕西省公益性基础地质调查项目(编号:20150103、20170103)资助。 |
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| 中文摘要: |
| 南秦岭地区山阳中村—商南湘河一带发育下寒武统水沟口组(∈1sg)黑色岩系,是区内钒(金)矿的主要赋矿层位。该地层为一套含炭质、硅质、泥质、碳酸盐岩建造,主要岩性为硅质岩、粘土岩、含炭灰岩、含炭硅质岩及炭硅质板岩,局部含磷结核。该地层中硅质岩的地球化学特征研究表明:硅质岩明显富集V、Ag、Cu、Pb、Zn、Bi、Mo、As、Sb、Hg、Cr、Ba、U、Tl、Se、Te、Y元素,且岩石中微量元素的富集程度与炭质关系密切；硅质岩形成于正常海水沉积,并可能受一定程度的热水作用影响,热水的形成与可能存在的海底火山喷流作用有关；硅质岩形成于由陆向海过渡的大陆边缘海环境,当时的海水盐度正常,且较纯硅质岩沉积时海水深度较大,处于一种厌氧的还原环境。 |
| 英文摘要: |
| The black rock series of Lower Cambrian Shuigoukou Formation (∈1sg), the main ore-bearing horizon of vanadium (gold) mineralization, are developed in Zhongcun-Xianghe area of Shanyang County, southern Qinling. The strata belong to a set of carbonate formation containing carbonaceous, siliceous and argillaceous composition. The main lithology is silicalite, claystone, carbonaceous limestone, carbonaceous silicalite and carbonaceous-siliceous slate, with locally developed phosphatic nodules. The geochemical characteristics of the silicalite of the strata show that the silicalite is obviously enriched in V, Ag, Cu, Pb, Zn, Bi, Mo, As, Sb, Hg, Cr, Ba, U, Tl, Se, Te and Y et al., and the enrichment degree of trace elements is closely related to the carbon contained in the rocks. The silicalite was likely derived from normal marine deposition, and maybe influenced by a certain extent of hydrotherm that generated from the action of possibly existed submarine volcano plume. Additionally, the silicalite was formed in the marginal sea environment of transition from continent to ocean, when the salinity of the sea water was normal, the sea depth was larger while depositing purer silicalite, and belonged to the anaerobic reductive environment. |
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