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中祁连东段晋宁期碰撞型花岗岩及其地质意义

引用本文：郭进京,赵凤清,李怀坤.1999.中祁连东段晋宁期碰撞型花岗岩及其地质意义[J].地球学报,20(1):10-15.

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作者	单位
郭进京	西北大学地质系
赵凤清	中国地质科学院天津地质矿产研究所
李怀坤	中国地质科学院天津地质矿产研究所

中文摘要:对中祁连地块东段西宁西部近Ｓ－Ｎ向展布的元古宙花岗岩带地质地球化学和年代学研究表明：它侵位于元古宙基底中浅变质岩系湟源群中，具有同碰撞Ｓ型花岗岩的性质；（９１７±１２）Ｍａ的单颗粒锆石Ｕ－Ｐｂ年龄记录了其侵位的时代为新元古宙晋宁期，这一新元古宙晋宁期碰撞型花岗岩带具有重要的地质意义。

中文关键词:中祁连地块东段新元古宙碰撞型花岗岩晋宁期碰撞带 S-N向构造

Jinningian Collisional Granite Belt in the Eastern Sector of the Central Qilian Massif and Its Implication

Abstract:The Proterozoic granite belt emplaced into the Huangyuan Group a medium-and low-grade metamorphic series of the Proterozoic basement in the eastern central Qilian massif extends in a N S direction.Its geochemical features indicate that it is a syn-collisional S-type granite belt. (917±12) Ma of single-grain zircon U-Pb age constrains its emplacement age. From above it is suggested that the easten central Qilian massif had undergone Jinningian collisional orogenesis. Finally the authors discuss the geological implication of the Proterozoic syn-collisional granite belt in the easten central Qilian massif.

keywords:eastern central Qilian massif Neoproterozoic syn-collisional granite Jinningian collisional zone N-S trending structure

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