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首页> 外文期刊>Pure and Applied Geophysics >Seismically Derived Gondwana and Proterozoic Sediments East of Cuddapah Basin, South Indian Shield and Its Possible Geotectonic Implications
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Seismically Derived Gondwana and Proterozoic Sediments East of Cuddapah Basin, South Indian Shield and Its Possible Geotectonic Implications

机译：南印度盾构以东地震衍生的巩固峡谷和前古代沉积物及其可能的地理位置意义

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摘要

The study area situated east of the intracratonic Proterozoic Cuddapah basin, that covers Nellore Schist belt, Ongole domain of the Eastern Ghats Belt and adjacent East Coast Terrain, forms a geodynamically important segment of the Dharwar craton. This region came into focus due to proposition that during Paleoproterozoic to Mesoproterozoic era, it underwent persistent oceanic subduction, continent-continent collision and multi-stage accretional growth. In view of this, we have reprocessed in detail the deep seismic sounding data over this region and integrated the obtained results with other geophysical studies to decipher the deep subsurface crustal structure underneath. The derived shallow seismic section across this region showed the presence of a thin layer (similar to 250 m) of Gondwana sediments with a distinct velocity of 4.20 km/s and a lateral dimension of about 40 km around Vinjamuru region of the Nellore Schist Belt. Another important finding has been the depiction of 5.3 and 5.5 km/s velocity sediments (comparable to upper and lower Cuddapah sediments) between Nellore Schist Belt and the east coast, indicating the possible presence of an additional Proterozoic sedimentary terrain (named here as East Coast Sedimentary Basin), overlying the concealed Archean crystalline basement. The presence of this sedimentary terrain, which is separated from the Cuddapah basin by an exhumed horst-like feature, situated below Nellore Schist Belt, would indicate Proterozoic sedimentation in a much larger area during Columbia and Rodinia supercontinental assembly periods than hitherto known. Importantly, no seismic trace of the Eastern Ghats Belt has been found between Nellore Schist Belt and the east coast. It appears that during the Gondwana period, entire eastern segment of the east Dharwar craton has been persistently rifting, uplifting and eroding together with other Gondwana grabens in India, thereby leaving behind only a thin veneer of Gondwana sediments at many places. In view of the presence of number of Gondwana occurrences all along the east coast, it is felt that the rifting during the Gondwana period may have been a prelude to India-Antarctica breakup, with final separation between the two taking place much later during early Cretaceous.
机译：位于跨校前古代Cuddapah盆地东部的研究区，涵盖了东部巨额龙头带和毗邻东海岸地形的奥罗尔分座腰带，形成了Dharwar Craton的几步重要段。由于主题在古普罗科奇至中核古代时代，这一区域陷入了焦点，它接受了持续的海洋俯冲，大陆碰撞和多阶段增生。鉴于此，我们已经详细再处理了该区域的深层地震探测数据，并将所获得的结果与其他地球物理研究结合以破译下面的深层地壳结构。该区域的衍生浅地震截面显示出薄层（类似于250米）的Gondwana沉积物，其具有4.20km / s的不同速度和横向尺寸，横向尺寸约为40 km，周围的牙齿分型的vinjamuru区约40km。另一个重要的发现一直是无特派塞腰带和东海岸之间的5.3和5.5公里/克/升速度沉积物（可与上层和下部和下部和下部和下部和下部和下部和下部和下部和下部和下部和下部和下层藏族）。表明可能存在额外的正面古代沉积地形（在这里命名为东海岸沉积盆地），覆盖隐藏的Archean Crystalline地下室。这种沉积地形的存在，它通过挖掘的秀丽特征与位于无牙科皮带下方的挖掘秀地区分开，将在哥伦比亚和罗比尼亚超中心组装期间在哥伦比亚和罗比尼亚超中心组装时期的更大区域中表明正常古代沉降。重要的是，在Nellore Schist Belt和东海岸之间发现了东部掠夺带的地震轨迹。看来，在吉隆坡时期，东达尔瓦尔·克拉顿的整个东部一直持续越来越脱离，与印度的其他机器人争夺，从而留下了许多地方只留下了一个薄的沉积物的薄薄单板。鉴于东海岸所有灯笼发生的存在，有人认为，在南极洲的徘徊期间可能是印度 - 南极洲分手的前奏，两者之间的最终分离在早期的白垩纪后期。

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