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首页> 外文期刊>Geology >MULTIPLE POSTOROGENIC DENUDATION EVENTS - AN EXAMPLE FROM THE EASTERN LACHLAN FOLD BELT, AUSTRALIA
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MULTIPLE POSTOROGENIC DENUDATION EVENTS - AN EXAMPLE FROM THE EASTERN LACHLAN FOLD BELT, AUSTRALIA

机译：多种造山带剥蚀事件-以澳大利亚拉腊兰东部褶皱带为例

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摘要

Fission-track results from 40 surface samples from the eastern part of the Lachlan fold belt, Australia, suggest that two distinct episodes of rapid kilometre-scale denudation have occurred since the middle Carboniferous, when deformation within the fold belt is believed to have ceased. The first episode, during the Early Triassic, was possibly in response to the Hunter-Bowen orogeny, which affected the New England fold belt and the Sydney-Bowen basin, but the effects of which have previously not been recognized within the Lachlan fold belt. The second episode occurred during the middle Cretaceous, possibly in response to the onset of continental extension in the Tasman Sea ca, 96 Ma. Uplift at this time resulted in kilometre-scale denudation over much of the southeastern highlands of Australia and may have been caused by underplating inward of the rift. These results indicate that the Lachlan fold belt has remained tectonically active long after the last recognized deformational event in the region, and highlight the importance of fission-track data in elucidating the posttectonic histories of orogens previously undetected due to a lack of stratigraphic and structural crosscutting relationships. [References: 24]
机译：来自澳大利亚拉克兰褶皱带东部的40个表面样本的裂变径迹结果表明，自中石炭纪以来，在褶皱带内的变形已经停止的情况下，发生了两次明显的公里速剥蚀。三叠纪早期的第一集可能是对亨特-博文造山运动的反应，该运动影响了新英格兰褶皱带和悉尼-博汶盆地，但在拉克兰褶皱带之前尚未认识到其影响。第二个事件发生在白垩纪中段，可能是由于塔斯曼海大约96 Ma大陆扩张的开始。此时的隆升导致了澳大利亚东南高地大部分地区的千米规模剥蚀，这可能是由裂谷向内的下冲造成的。这些结果表明，Lachlan褶皱带在该地区最后一次认识到的变形事件之后仍保持构造活动，并强调了裂变径迹数据在阐明以前由于缺乏地层和构造横切面而未被发现的造山带的构造历史中的重要性。关系。 [参考：24]

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