| 金灿海,朱同兴,于远山,周帮国.北羌塘地区冬布勒山基性、超基性岩特征及构造意义[J].矿产勘查,2011,2(1):67-74 |
| 北羌塘地区冬布勒山基性、超基性岩特征及构造意义 |
| Characteristics and tectonic significance of Dongbuleshan basic-ultrabasic rocks in Northern Qiangtang Region |
| 投稿时间：2010-05-19 |
| DOI： |
| 中文关键词: 羌塘地区北部 冬布勒山 超镁铁岩 变质玄武岩 蛇绿混杂岩 |
| 英文关键词: ultramafic rocks metabasalts ophiolite melange Dongbuleshan northern Qiangtang Region |
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| 中文摘要: |
| 冬布勒山基性、超基性岩产于若拉岗日逆冲断裂带北侧,近东西向展布,岩石组合为超镁铁岩及变质玄武岩,与千枚岩、硅质岩、碳酸盐岩共生 , 呈岩块状镶嵌于上三叠统若拉岗日岩群砂泥质复理石、中基性火山岩及灰岩中。超镁铁岩浆来自亏损的地幔, 并受壳源物质混染；玄武岩贫钾富钠,属钙碱性、碱性系列,为过渡型洋脊玄武岩,它们为蛇绿岩残片,与西侧大横山、弯岛湖蛇绿混杂岩带、东部康特金—岗齐曲蛇绿混杂岩带处于同一构造带,东连金沙江蛇绿岩带,是古特提斯洋壳向北俯冲消减过程中形成的增生楔。 |
| 英文摘要: |
| Dongbuleshan basic-ultrabasic rocks, located at the northern of Ruolagongri thrust fault zone, occurred along the east-west direction together with the phyllite, siliceous, and carbonate rocks. They were mosaic in a massive rock early Triassic Ruolagangri Rock Group flysch sand-mud rocks, intermediate-mafic volcanic rocks and limestone rocks. Ultramafic rocks, derived from depleted mantle, are subjected to the contamination by crustal material; the basalt rocks are poor-K and Na-rich, and belong to calc-alkaline-alkaline series. These transition-mid ocean ridge basalts originated from the fragments of the ophiolite, and belong to the same tectonic zone, together with Dahengshan-Wandaohu ophiolite belt to the west and Kangtejin-Gangqiqu ophiolite belt to the east. They occurred with Jinsha River ophiolite belt to the east. All belong to the accretionary wedge, which due to the northward subduction of the ancient Tethyan oceanic crust. |
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