东昆仑东端苦海-赛什塘地区晚古生代蛇绿岩的地质特征

苦海—赛什塘一带断续分布着众多镁铁-超镁铁质岩岩块, 各种地质特征显示它们在成因上密切相关, 共同构成了曾经存在过的被肢解破碎的洋壳残迹.岩石地球化学特征反映它们源于类似于OIB或E -MORB的富集型地幔源区, 并可能形成于初始扩张的小洋盆或消减带之上区域, 同位素测年资料显示洋盆初始扩张可能在D3, 俯冲消减时间在P₁-P₂. 

GEOLOGICAL FEATURES OF LOWER PALEOZOIC OPHIOLITE IN KUHAI-SAISHITANG REGION, EASTERN SECTION OF EASTERN KUNLUN

Mafic ultramafic rock blocks, consecutively distributed in Kuhai Saishitang region, are closely associated with each other in origin, as shown by their different geological features. These rock masses constitute the oceanic crust vestiges that once existed but later were broken. The petro geochemical features show that the rock masses originating from the enrichment mantle source similar to that of OIB or E MORB, may have occurred in the region above the initial spreading small oceanic basin or subduction zone. The isotope dating references show that the initial spreading of the oceanic basin may have occurred in D 3, and the subduction may have occurred in P 1-P 2.