新疆南天山塔什库尔干泥盆—早石炭世洋岛型火山岩的确定及地质意义  

DETERMINATION AND GEOLOGICAL SIGNIFICANCE OF OCEAN ISLAND VOLCANIC ROCKS OF THE DEVONIAN-EARLY CARBONIFEROUS IN TAXKORGAN REGION,SOUTHERN TIANSHAN OF XINJIANG

作　　者：陈刚[1,2] 朱志新[3,4] 董连慧[2] 刘斌[2] 倪新元[3] 赵恒乐 

机构地区：[1]中国地质大学,北京100083 [2]新疆维吾尔自治区地质矿产勘查开发局,新疆乌鲁木齐830011 [3]新疆维吾尔自治区地质矿产调查研究院,新疆乌鲁木齐830011 [4]新疆大学,新疆乌鲁木齐830000

出　　处：《新疆地质》2010年第3期236-241,共6页Xinjiang Geology

基　　金：由博士后基金(200902617);"十一五"国家科技支撑计划重点项目(编号2006BAB07B00)资助

摘　　要：南天山黑英山-库勒湖洋壳残片内发育一套具洋岛特征的火山岩,岩石组合为碱性中基性火山碎屑岩和熔岩,形成时代为泥盆纪—早石炭世,其中基性熔岩岩石化学特征具高钾和高钛特征,稀土元素具轻稀土富集、重稀土亏损的右倾稀土分布型式,微量元素除Y、Yb外,其它元素具富集的大陆隆起洋岛碱性玄武岩特征,说明泥盆纪—早石炭世南天山洋盆形成新生洋壳,洋盆具一定规模.There is one set of ocean island volcanic rocks in Heiyin mountains-Kule lake oceanic basin of southern Tianshan,the rocks combination is alkali intermediate-basic pyroclastic rock and lava,petrogenetic age is Devonian-early carboniferous.And the petrochemistry characteristics of intermediate-basic lava is high K and Ti,there are depleted in HREE and enriched in LREE,characteristics of microelement is all elements is enriched except Y,Yb,it belongs to raise ocean island alkali basalt.It is show that southern Tianshan ocean basin forms new ocean crust sequentially in Devonian-early carboniferous era and has considerable size.

关 键 词：新疆 南天山 洋岛 基性熔岩 

分 类 号：P588.14[天文地球—岩石学]