New evidence for the early onset of supergene alteration along the Kalahari unconformity

N.A. Vafeas; L.C. Blignaut; K.S. Viljoen; S. Meffre

首页> 外文期刊>South African Journal of Geology: Being the Transaction of the Geological Society of South African: Syndie die Verhandelinge van die Geologiese Vereniging van Suid-Afrika >New evidence for the early onset of supergene alteration along the Kalahari unconformity

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New evidence for the early onset of supergene alteration along the Kalahari unconformity

机译：沿着Kalahari不整合的超级改变早期发病的新证据

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The manganese ore of the Hotazel Formation in the Kalahari Manganese Field, which has been thrust along the Blackridge thrust fault, has been subjected to various degrees of pre-thrusting hydrothermal and post-thrusting supergene alteration. Coarse-grained apatite, which appears to be formed under supergene conditions on textural grounds, is present in the thrusted manganese ore in previously unrecorded abundances. U-Pb dating of this apatite within the thrusted manganese ore has placed the onset of chemical weathering of the succession at a 77 ± 7.5 Ma, approximately 35 million years earlier than previously thought for the area. This implies that erosion along the Post- African I land surface, as well as the effects of supergene alteration in the Kalahari Manganese Field must have commenced within the late Cretaceous Period, subsequent to earlier erosion along the African land surface.

机译：Kalahari锰领域的HANGANESE ORE沿着Blackridge推力断裂推动，已经受到各种程度的预推力水热和后推迟叠加的超劣质改变。似乎似乎在脊脂条件下在纹理场上形成的粗粒状磷灰石，以前未记录的丰富的推力锰矿矿石中存在。在推力锰矿中的这种磷灰石的U-PB约会已经在77±7.5 mA的速度下放置了化学风化，比以前对该地区思考的约3500万年来了。这意味着非洲后我的土地表面侵蚀，以及Kalahari锰领域的叠加级改变的影响必须在晚期白垩纪期间开始，以后沿着非洲土地表面的早期侵蚀。

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来源
《South African Journal of Geology: Being the Transaction of the Geological Society of South African: Syndie die Verhandelinge van die Geologiese Vereniging van Suid-Afrika》 |2018年第2期|共14页
作者
N.A. Vafeas; L.C. Blignaut; K.S. Viljoen; S. Meffre;
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作者单位

Department of Geology University of Johannesburg South Africa;

Department of Geology University of Johannesburg South Africa;

Department of Geology University of Johannesburg South Africa;

CODES/Earth Sciences University of Tasmania Australia;

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原文格式 PDF
正文语种 eng
中图分类地质学;
关键词
New evidence; the early; onset;

机译：新的证据;早期;发病;

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1. New evidence for the early onset of supergene alteration along the Kalahari unconformity [J] . N.A. Vafeas, L.C. Blignaut, K.S. Viljoen, South African Journal of Geology: Being the Transaction of the Geological Society of South African: Syndie die Verhandelinge van die Geologiese Vereniging van Suid-Afrika . 2018,第2期

机译：沿着Kalahari不整合的超级改变早期发病的新证据
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New evidence for the early onset of supergene alteration along the Kalahari unconformity

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