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The 40 Ar- 39 Ar ages of hornblendes in Grt-Pl-bearing amphibolite from the Larsemann Hils, East Antarctica and their geological implication

【标题】The 40 Ar- 39 Ar ages of hornblendes in Grt-Pl-bearing amphibolite from the Larsemann Hils, East Antarctica and their geological implication

【Title】The 40 Ar- 39 Ar ages of hornblendes in Grt-Pl-bearing amphibolite from the Larsemann Hils, East Antarctica and their geological implication

【作者】 仝来喜; 刘小汉; 张来生; 陈海泓; 王彦斌; 任留东

【Author】 Tong Laixi ; Liu Xiaohan ; Zhang Laisheng ; Chen Haihong ; Wang Yanbin ; Ren Liudong

【期刊】极地研究

【Journal】

【期刊年份】1998

【卷】9

【期】

【关键词】 East Antarctica; Grt-P1-bearing amphibolite; hornblendes; 40 Ar- 39 Ar ages; tectonothermal events

【Keywords】 East Antarctica; Grt-P1-bearing amphibolite; hornblendes; 40 Ar- 39 Ar ages; tectonothermal events

【摘要】In this paper we reported the 40 Ar- 39 Ar dating results of hornblendes in Grt-P1-bearing amphibolite from the Larsemann Hills, East Antarctica. Their apparent ages respectively are 1586 Ma, 1011-1080 Ma, 761 Ma, 529-582 Ma. Their plateau ages of 1036 Ma and 554 Ma as well as an Ar-Ar isochron age of 1010 Ma have also been obtained respectively. These isotopic dating results for the first time by the Ar-Ar method for hornblendes completely record almost all the structural metamorphic thermal events that this region experienced, and provide an answer to the controversial question on the structural metamorphic thermal events of this region in recent several years, namely, which one is more important, the late Proterozoic 1000 Ma event (Grenvillian) or the early Palaeozoic 500 Ma event ( Pan African), as well as whether the former exists or not. The 40 Ar- 39 Ar dating results of hornblendes show that the Larsemann Hills experienced a complicated poly metamorphic evolutionary history, and their protoliths were probably formed in early to mid Proterozoic. The late Proterozoic 1000 Ma event (Grenvillian) has been confirmed to be a predominant tectonothermal event whilst the early Palaeozoic 500 Ma event (Pan-African) has been confirmed just to be the last strong tectonothermal event in this region.

【Abstract】In this paper we reported the 40 Ar- 39 Ar dating results of hornblendes in Grt-P1-bearing amphibolite from the Larsemann Hills, East Antarctica. Their apparent ages respectively are 1586 Ma, 1011-1080 Ma, 761 Ma, 529-582 Ma. Their plateau ages of 1036 Ma and 554 Ma as well as an Ar-Ar isochron age of 1010 Ma have also been obtained respectively. These isotopic dating results for the first time by the Ar-Ar method for hornblendes completely record almost all the structural metamorphic thermal events that this region experienced, and provide an answer to the controversial question on the structural metamorphic thermal events of this region in recent several years, namely, which one is more important, the late Proterozoic 1000 Ma event (Grenvillian) or the early Palaeozoic 500 Ma event ( Pan African), as well as whether the former exists or not. The 40 Ar- 39 Ar dating results of hornblendes show that the Larsemann Hills experienced a complicated poly metamorphic evolutionary history, and their protoliths were probably formed in early to mid Proterozoic. The late Proterozoic 1000 Ma event (Grenvillian) has been confirmed to be a predominant tectonothermal event whilst the early Palaeozoic 500 Ma event (Pan-African) has been confirmed just to be the last strong tectonothermal event in this region.

【基金/项目】

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