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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 >Constraining the timing and migration of collisional tectonics in the Damara Belt, Namibia: U-Pb zircon ages for the syntectonic Salem-type Stinkbank granite
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Constraining the timing and migration of collisional tectonics in the Damara Belt, Namibia: U-Pb zircon ages for the syntectonic Salem-type Stinkbank granite

机译：纳米比亚达马拉地带碰撞构造的时间和迁移受到限制：同构造塞勒姆型臭库克花岗岩的U-Pb锆石年龄

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摘要

A U-Pb zircon LAM-ICP-MS age of 549 +/- 11 Ma from the Stinkbank granite in the south Central Zone of the Damara belt represents the first robust age for the crystallization of a member of the regionally widespread suite of syntectonic Salem-type granites. This age confirms previous assertions that suggest that the main phase of crustal shortening related to the collision between the Congo and Kalahari Cratrons occurred between 550 and similar to 540 Ma in the south Central Zone, the leading edge of the Congo Craton. Ages from syntectonic granites reported in the literature from the north Central and the Northern Zone record progressively younger ages of similar to 530 to similar to 515 Ma and the late-stage folding in the Northern Zone is suggested to have occurred between similar to 510 to similar to 500 Ma. The younging of ages that date the main collisional phase towards the north is interpreted to track the northward propagation of the deformation and metamorphic front from the main suture zone to the northern foreland of the Damara belt. Geochronological data are sparse, and the lack of detailed structural data precludes the retrodeformation of the fold-and-thrust belt along this 250 km long section. However, the age brackets suggest a migration of the orogenic front at a rate of at least 5 to 7 mm/a, but more likely in the order of several centimetre per year, if the internal strain is removed.
机译：位于达马拉地带中南部南部的Stinkbank花岗岩的U-Pb锆石LAM-ICP-MS年龄为549 +/- 11 Ma，代表着该地区构造上广泛的萨利姆组成员的结晶的第一个强固年龄。型花岗岩。这个年龄证实了先前的断言，即与刚果和喀拉哈里山克拉通碰撞有关的地壳缩短的主要阶段发生在刚果南部克拉通前缘中南部地区550至540 Ma之间。北部中部和北部地区文献中报道的同构花岗岩年龄逐渐趋于年轻，年龄从530到515 Ma相似，并且建议北部地区的后期折叠发生在510到相似之间。至500毫安主要碰撞阶段朝北的年龄的年轻化被解释为跟踪变形和变质锋面从主缝合带向达马拉地带北部前陆的向北传播。地质年代数据稀疏，缺乏详细的结构数据，使得沿这条250 km长的断层和逆冲带逆行变形。但是，年龄段表明造山带锋面的迁移速度至少为5至7 mm / a，但如果去除内部应变，则每年迁移几厘米的可能性更大。

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