地质通报
地質通報
지질통보
GEOLOGICAL BULLETIN OF CHINA
2010年
1期
79-85
,共7页
张亚峰%裴先治%丁仨平%李瑞保%冯建赟%孙雨%李佐臣%陈有炘
張亞峰%裴先治%丁仨平%李瑞保%馮建赟%孫雨%李佐臣%陳有炘
장아봉%배선치%정삼평%리서보%풍건빈%손우%리좌신%진유흔
石英闪长岩%LA-ICP-MS%锆石%U-Pb%同位素年龄%都兰可可沙地区%东昆仑造山带
石英閃長巖%LA-ICP-MS%鋯石%U-Pb%同位素年齡%都蘭可可沙地區%東昆崙造山帶
석영섬장암%LA-ICP-MS%고석%U-Pb%동위소년령%도란가가사지구%동곤륜조산대
quartz diorite%LA-ICP-MS zircon U-Pb isotope age%Kekesha area of Dulan Count%East Kunlun orogenic belt
野外调研和室内综合分析表明,出露于东昆仑造山带东段都兰可可沙地区的加里东期石英闪长岩体包括4种岩石类型:①灰一深灰色中粒石英闪长岩;②灰色中粒片麻状石英闪长岩;③灰色中粗粒角闪石英闪长岩;④浅肉红色中细粒似斑状二长花岗岩.用LA-ICP-MS法进行了锆石U-Pb同位素年龄测定,样品11013的锆石~(206)Pb/~(238)U加权平均年龄为515.2Ma±4.4Ma.(MSWD=2.5),限定该石英闪长岩体的形成时代为中寒武世,表明东昆仑造山带加里东早期存在一期岩浆活动事件.
野外調研和室內綜閤分析錶明,齣露于東昆崙造山帶東段都蘭可可沙地區的加裏東期石英閃長巖體包括4種巖石類型:①灰一深灰色中粒石英閃長巖;②灰色中粒片痳狀石英閃長巖;③灰色中粗粒角閃石英閃長巖;④淺肉紅色中細粒似斑狀二長花崗巖.用LA-ICP-MS法進行瞭鋯石U-Pb同位素年齡測定,樣品11013的鋯石~(206)Pb/~(238)U加權平均年齡為515.2Ma±4.4Ma.(MSWD=2.5),限定該石英閃長巖體的形成時代為中寒武世,錶明東昆崙造山帶加裏東早期存在一期巖漿活動事件.
야외조연화실내종합분석표명,출로우동곤륜조산대동단도란가가사지구적가리동기석영섬장암체포괄4충암석류형:①회일심회색중립석영섬장암;②회색중립편마상석영섬장암;③회색중조립각섬석영섬장암;④천육홍색중세립사반상이장화강암.용LA-ICP-MS법진행료고석U-Pb동위소년령측정,양품11013적고석~(206)Pb/~(238)U가권평균년령위515.2Ma±4.4Ma.(MSWD=2.5),한정해석영섬장암체적형성시대위중한무세,표명동곤륜조산대가리동조기존재일기암장활동사건.
After detailed field survey and indoor analysis.the quartz diorites exposed at dle Kekesha area of Dulan,eastem section of the East Kunlun orogenic belt,include four types of rocks:(1) Gray-dark gray medium grained quartz diorite;(2) Gray medium grained gneissic quartz diorite;(3)Gray medium-coarse grained amphibole quartz diorite;(4)Light flesh-red medium-fine grained porphraceous adamellite.LA-ICP-MS method is used to determine the zircon U-Pb isotope age of the rock,which shows that the zircon ~(206)pb/~(295)U weighted average age of the sample 11013 is 515.2±4.4Ma(MSWD=2.5) and defines the crystallization age of the rocks in Middle Cambrian period.It indicated that East Kunlun orogenic belt had experienced a magmatism event during the early Caledonian .
