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广西东南部钦防海槽晚古生代硅质岩地球化学特征及其地质意义*

DOI: 10.7605/gdlxb.2014.01.077, PP. 77-88

Keywords: 钦防海槽,硅质岩,地球化学,晚古生代

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Abstract:

广西东南部钦防海槽地区晚古生代硅质岩十分发育。对硅质岩主量元素、微量元素及稀土元素的分析结果表明:该区晚古生代硅质岩含有较高的SiO2,硅化程度较高;除上泥盆统弗拉斯阶及下石炭统硅质岩具有较低的Al/(Al+Fe+Mn)值(0.14~0.24;0.07~0.81)及较高的U/Th值(0.34~5.09;0.16~10.1)外,其他层位硅质岩具有较高的Al/(Al+Fe+Mn)值(0.4~0.95)及较低的U/Th值(0.1~2.1);上泥盆统硅质岩稀土元素比值Ce/Ce*、LaN/YbN及LaN/CeN值分别为0.78~1.08、0.4~1.52和0.88~1.35,而下石炭统硅质岩具有较低的Ce/Ce*值(0.55~0.91)、LaN/YbN值(0.12~1.8)及较高的LaN/CeN值(1.12~1.79),中下二叠统硅质岩Ce/Ce*、LaN/YbN及LaN/CeN值分别为1.01~1.62、0.72~2.71和0.62~1.9。钦防海槽晚古生代硅质岩地球化学特征表明:晚泥盆世钦防海槽发生扩张,热液活动比较强烈,处于大陆边缘海环境;早石炭世钦防海槽再次发生扩张,热液活动强烈,硅质岩形成于远离陆源的深海海盆环境;早中二叠世,钦防海槽逐渐收缩,海水变浅。钦防海槽晚古生代并没有出现真正的洋壳,可能属于晚古生代古特提斯分支洋盆的一个坳拉槽盆地。

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