Sm‐Nd model ages across the margins of the Archaean Yilgarn Block, Western Australia — III. The western margin
Sm‐Nd model ages across the margins of the Archaean Yilgarn Block, Western Australia — III. The western margin
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DOI：
10.1080/08120098508729314
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发表时间：
1985-03
影响因子：
1.2
通讯作者：
I. Fletcher;S. Wilde;K. Rosman
中科院分区：
文献类型：
--
作者：
I. Fletcher;S. Wilde;K. Rosman
Earlier studies of the nature and extent of Proterozoic activity around the Archaean Yilgarn Block, based on Sm‐Nd model ages, have now been extended by an examination of the western margin. New data from the western Yilgarn Block indicate that rocks of the Chittering Metamorphic Belt (2.8–2.9 Ga) are significantly younger than rocks in the other three metamorphic belts of the Western Gneiss Terrain (literature values ≥3.0 Ga). This suggests possible continental growth by marginal accretion during the Archaean. Data from Yilgarn Block granitoids indicate a complex and extended period of generation, ranging from 2.7 to 3.1 Ga. There is a major time break at the western margin of the Yilgarn Block, marked by the Darling Fault. All rocks sampled W of the fault have Proterozoic model ages. This confirms the existence of a Proterozoic mobile belt along the western edge of the Yilgarn Block and provides further evidence that the present Darling Fault follows a zone of Precambrian crustal discontinuity. The rema...
