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首页> 外文期刊>Journal of Palaeogeography >Lithofacies architecture and palaeogeography of the Late Paleozoic glaciomarine Talchir Formation, Raniganj Basin, India
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Lithofacies architecture and palaeogeography of the Late Paleozoic glaciomarine Talchir Formation, Raniganj Basin, India

机译：印度Raniganj盆地晚古生代冰川期Talchir组的岩相构造和古地理

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Abstract Talchir Formation (Permo–Carboniferous) of the Gondwana Supergroup records the Late Paleozoic glaciation in Peninsular India. Talchir sedimentary succession of the Raniganj Basin, Damodar Valley Coalfields, Peninsular India, bears ten facies types grouped under three facies associations, viz., the proglacial conglomerate–sandstone facies association (CS), the foreshore–shoreface conglomerate–sandstone–mudstone facies association (CSM) and the prodelta–shelf sandstone–mudstone facies association (SM). Overall facies architecture reflects initial ice–covered terrestrial subglacial sedimentation, which was subsequently reworked and emplaced subaqueously in front of the ice–grounding line, and finally overlapped by storm–laid prodelta–shelf sediments. Repeated glacial advance–retreats with shifts in the position of the ice–grounding line during phases of climatic amelioration led to multiple deglaciation– related fining–up cycles. Decoupled ice sheet and floating icebergs contributed icerafted debris (IRD) to these sediments. Gradual retreat of the ice sheet, however, restricted the supply of {IRD} towards top of the succession. Overlap of wave–agitated shoreface–shelf sediments on the glaciogenic sediments indicates widespread marine transgression caused by glacier melting during ice–house to green–house climatic transition, and crustal downsagging related to glacioisostasy. Subsequently, complete disappearance of the ice sheet caused basinal exhumation along with crustal uplift due to isostatic rebound, leading to multiple horst–graben bounded basinal systems, which received post–Talchir coal–bearing Gondwana sediments.
机译：冈瓦纳超群的抽象塔尔奇尔组（二叠纪—石炭纪）记录了印度半岛晚期的古生代冰川期。印度半岛达莫达河谷煤田Raniganj盆地的Talchir沉积演替具有十种相类型，分为三个相协会，即，前冰砾岩-砂岩相协会（CS），前滨-岸面砾岩-砂岩-泥岩相协会（CSM）和前陆-陆架砂岩-泥岩相协会（SM）。总体相结构反映了最初被冰覆盖的陆地冰下沉积，随后对其进行了改造并在水下将其置于冰底线的前面，最后被暴风雨的三角洲-陆架沉积物所覆盖。在气候改善阶段，随着冰川前进线的反复冰川退缩，导致了与冰川融化有关的多次精细化循环。分离的冰原和漂浮的冰山对这些沉积物造成了冰筏碎屑（IRD）。然而，冰原的逐渐后退，限制了{IRD}的供应量。波浪成因的海岸-陆架沉积物在成冰沉积物上的重叠表明，大范围的海侵是由于冰室到温室气候过渡期间的冰川融化以及与冰川等静线有关的地壳下陷引起的。随后，冰盖完全消失，由于等静回弹，导致盆地发掘以及地壳隆升，导致了多个以霍斯特-格拉本为界的盆地系统，这些系统接受了塔尔奇尔后含煤的冈瓦纳沉积物。

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