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首页> 外文期刊>Journal of Asian earth sciences >Paleostrain stratigraphic analysis of calcite twins across the Cambrian-Ordovician unconformity in the Tethyan Himalaya, Spiti and Zanskar valley regions, India
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Paleostrain stratigraphic analysis of calcite twins across the Cambrian-Ordovician unconformity in the Tethyan Himalaya, Spiti and Zanskar valley regions, India

机译：印度特提斯喜马拉雅山，斯皮提河和赞斯卡河谷地区寒武纪-奥陶纪不整合面中方解石孪晶的古应变地层分析

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摘要

Calcite strain analyses were conducted on low-grade Cambrian and Carboniferous limestone samples collected above and below the Cambrian-Ordovician unconformity in the Spiti and Zanskar valley regions of the NW Himalaya in order to compare strain patterns in rocks that bracket an enigmatic early Paleozoic tectonic episode. All samples record a layer-parallel shortening strain at a high angle to folds and faults in the Tethyan Himalayan fold-thrust belt. In the Carboniferous samples, we relate these layer-parallel strains to the onset of Cenozoic deformation within the Tethyan Himalayan fold-thrust belt. The Cambrian sample from the Spiti area contains a layer-parallel shortening strain even though the Cambrian-Ordovician unconformity is angular. This suggests that the twinning strains in the Cambrian sample may have formed at the onset of early Paleozoic folding and subsequent erosion, and that early phases of Cenozoic shortening were coaxial to early Paleozoic shortening. The maximum shortening axis in the Carboniferous samples, which is probably parallel to the early thrust transport direction in the Tethyan Himalayan fold-thrust belt, is parallel to the NE movement of India with respect to Eurasia in the Middle Eocene, suggesting that it might closely correspond to the India/Eurasian slip direction during this time period.
机译：对喜马拉雅山西北部Spiti和Zanskar谷地区寒武纪-奥陶纪不整合面之上和之下采集的低品位寒武纪和石炭纪石灰岩样品进行了方解石应变分析，以比较岩石中包含神秘早古生代构造事件的应变模式。所有样品均在高角度记录了特提斯喜马拉雅褶皱冲断带中褶皱和断层的平行层缩短应变。在石炭纪样品中，我们将这些平行层应变与特提斯喜马拉雅褶皱冲断带内新生代形变的发生联系起来。尽管寒武纪-奥陶纪不整合面呈角度，但来自斯皮提地区的寒武纪样品仍具有平行于层的缩短应变。这表明寒武纪样品中的孪生应变可能是在早古生代折叠和随后的侵蚀开始时形成的，新生代缩短的早期阶段与早古生缩短是同轴的。石炭纪样品的最大缩短轴可能与特提斯喜马拉雅褶皱冲断带的早期逆冲输送方向平行，与印度相对于始新世中欧亚大陆的东北运动平行。对应于这段时间的印度/欧亚滑动方向。

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