东天山大盐池西闪长岩锆石SHRIMP U-Pb测年——对伴生超基性岩时代下限的制约
SHRIMP U-Pb dating of zircons from the west Dayanchi diorite in the East Tianshan, Xinjiang, China-Constraints on the lower boundary of the age of the associated ultramafic rocks
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摘要: 大盐池西超基性岩一直缺乏可靠的年龄资料,因此时代厘定一直存在疑问。该超基性岩侵入于一个闪长岩体中,1∶5万区域地质矿产调查获得该闪长岩的年龄为303Ma±15Ma。这表明该超基性岩形成于晚石炭世以后。
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Keywords:
- ultrabasic rocks /
- diorite /
- zircon SHRIMP U-Pb dating /
- Late Carboniferous /
- Hami area /
- East Tianshan
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