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Formation Age of the Sujiagou Komatiites in Western Shandong: Further Constraints from SHRIMP U‐Pb Zircon Dating on Granitic Dykes
Acta Geologica Sinica-English Edition ( IF 3.3 ) Pub Date : 2020-08-30 , DOI: 10.1111/1755-6724.14549
Yushneg WAN 1 , Chunyan DONG 1 , Hangqian XIE 1 , Shijin WANG 2
Affiliation  

Komatiites are presented as direct evidence for higher mantle temperatures during the Archean. In the North China Craton, komatiites with spinifex structure have been identified only at one locality, i.e. the Sujiagou area, western Shandong. They were considered as formed during the early Neoarchean mainly based on their association with supracrustal rocks considered to be that age. This study carried out SHRIMP U‐Pb zircon dating on metamorphosed trondhjemitic and monzogranitic dykes intruding the Sujiagou komatiites, and they have magmatic zircon ages of 2592 ± 12 Ma and 2586 ± 13 Ma respectively. This provides direct evidence that the komatiites formed during the early Neoarchean.

中文翻译:

鲁西苏家沟科马提岩的形成时代:花岗岩堤上SHRIMP U-Pb锆石年代的进一步限制

提出的科马蒂岩是太古宙时期地幔温度升高的直接证据。在华北克拉通,仅在一个地区,即山东西部的苏家沟地区,就发现了具有尖刺结构的科马提岩。它们被认为是在新古构造时代初期形成的,主要是由于它们与被认为是该年龄的表壳岩石相关。这项研究对侵入苏家沟科马提岩的变质的准定居和单生龙岩进行了SHRIMP U-Pb锆石测年,它们的岩浆锆石年龄分别为2592±12 Ma和2586±13 Ma。这提供了直接证据,表明科马提岩是在新新纪元早期形成的。
更新日期:2020-08-30
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