严松涛,谭昌海,段阳海,代雪健

• 1:中国人民武装警察部队黄金第十二支队

摘要(Abstract)：

理塘地区擦岗隆洼岩组硅质岩的w(SiO2)为81.27%~92.71%,Si/Al比值为11.69~37.22,表明硅质岩的泥质成分相对较多,硅质岩样品的稀土元素总量较低,多介于22.61×10-6~41.67×10-6之间,轻稀土元素富集。硅质岩的w(V)为10.718×10-6~38.14×10-6,Ti/V比值为10.5~89.0,与大陆边缘硅质岩相应值相近。对硅质岩岩石学和地球化学的研究表明理塘洋盆于早三叠世就已经进入到洋壳俯冲消减、岛弧发育的活动陆缘演化阶段。

关键词(KeyWords)： 甘孜-理塘蛇绿混杂岩带;硅质岩;生物成因;大陆边缘-岛弧环境

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局地质调查项目(12120113071300;DD2016008014)

作者(Author): 严松涛,谭昌海,段阳海,代雪健

DOI: 10.19509/j.cnki.dzkq.2018.0303

参考文献(References)：

• [1]刘宝田,江耀明,曲景川.四川理塘-甘孜一带古洋壳的发现及其对板块构造的意义[M].北京:地质出版社,1983:119-127.
• [2]莫宣学,路凤香,沈上越,等.三江特提斯火山作用与成矿[M].北京:地质出版社,1993.
• [3]侯增谦,侯立玮,叶庆同,等.三江地区义敦岛弧构造-岩浆演化与火山成因块状硫化物矿床[M].北京:地震出版社,1995.
• [4]钟大赉.滇川西部古特提斯造山带[M].北京:科学出版社,1998.
• [5]侯增谦,卢记仁,李红阳,等.中国西南特提斯构造演化:幔柱构造控制[J].地球学报,1996,17(4):439-453.
• [6]Hou Zengqian,Zaw K,Pan Guitang,et al.Sanjiang Tethyan metallogenesis in S.W.China:Tectonic setting,metallogenic epochs and deposit types[J].Ore Geology Reviews,2007,31(1/4):48-87.
• [7]张世涛,冯庆来,王义昭.甘孜-理塘构造带泥盆系的深水沉积[J].地质科技情报,2000,19(3):17-20.
• [8]张世涛,冯庆来.中甸地区三叠系的沉积混杂作用[J].云南地质,2000,19(1):1-7.
• [9]冯庆来,张世涛,葛孟春,等.滇西北中甸地区哈工组放射虫及其构造古地理意义[J].地质科学,2002,37(1):70-78,131-132.
• [10]张旗,周国庆.中国蛇绿岩[M].北京:科学出版社,2001.
• [11]Yamamoto K.Geochemical characteristics and depositional environments of cherts and associated rocks in the Franciscan and Shimanto Terranes[J].Sedimentary Geology,1987,52:65-108.
• [12]Murray R W.Chemical criteria to identify the depositional environments of chert:General principles and applications[J].Sedimentary Geology,1994,90:213-232.
• [13]丁林,钟大赉.滇西昌宁-孟连带古特提斯洋硅质岩稀土元素和铈异常特征[J].中国科学:地球科学,1995,25(1):93-100.
• [14]陈玉禄,张宽忠,杨志民,等.青藏高原班公湖-怒江结合带中段那曲县觉翁地区发现完整的蛇绿岩剖面[J].地质通报,2006,25(6):694-699.
• [15]杨文强,冯庆来,刘桂春.滇西北甘孜-理塘构造带放射虫地层、硅质岩地球化学及其构造古地理意义[J].地质学报,2010,84(1):78-89.
• [16]胡世华,罗代锡,李开元.藏东川西三叠系沉积相及其构造意义[M].北京:地质出版社,1983:107-128.
• [17]张文,孙传敏,戴宗明,等.甘孜-理塘结合带通宵-理塘沿线蛇绿岩研究[J].云南地质,2012,31(3):406-411.
• [18]Sun S S,Mcdonough W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[C]∥Saunders A D,Norry M J.Magmatism in the ocean basins.London:Geological Society,Special Publications,1989,42:313-345.
• [19]Gromet L P,Dymek R F,Haskin L A,et al.The“North American shale composite”:Its compilation,major and trace element characteristics[J].Geochimica et Cosmochimica Acta,1984,48:2469-2482.
• [20]Murray R W,Buchholtz Ten Brink M R,Gerlach D C,et al.Rare earth,major,and trace element composition of Monterey and DSDP chert and associated host sediment:Assessing the influence of chemical fraction during diagenesis[J].Geochimica et Cosmochimica Acta.,1992,56:2657-2671.
• [21]Murray R W,Buchholtz Ten Brink M R,Gerlach D C,et al.Rare earth,major,and trace element in chert from Franciscan complex and Monterey Group:Assessing REE source to finegrained marine sediments[J].Geochimica et Cosmochimica Acta,1991,55:1875-1895.
• [22]Girty G H,Ridge D L,Knaack C,et al.Provenance and depositional setting of Paleozoic chert and argillite,Sierra Nevada,California[J].Journal of Sedimentary Research,1996,66(1):107-118.
• [23]Adachi M,Yamamoto K,Sugisaki R.Hydrothermal chert and associated siliceous rocks from the Northern Pacific,their geological significance as indication of ocean ridge activity[J].Sedimentary Geology,1986,47:125-148.
• [24]康健丽,张招崇,董书云,等.西南天山马达尔地区硅质岩地球化学特征及其沉积环境[J].岩石矿物学杂志,2010,29(1):79-89.
• [25]Murray R W,Buchholtz Ten Brink M R,Gerlach D C,et al.Rare earth and trace elements as indictors of different marine depositional environments of chert and shale[J].Geology,1990,18:268-271.