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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >The Talya Conglomerate: an Archean (similar to 2.7 Ga) Glaciomarine Formation, Western Dharwar Craton, Southern India
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The Talya Conglomerate: an Archean (similar to 2.7 Ga) Glaciomarine Formation, Western Dharwar Craton, Southern India

机译：塔利亚大集团：印度南部西部达瓦尔克拉顿的太古代（类似于2.7 Ga）冰川海洋层

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The similar to 2700 Ma Talya Conglomerate is comprised of 15 diamictites (i.e. matrix-supported conglomerates) interbedded with mudstone and sandstone units, and is interpreted as a glaciomarine deposit. The entire thickness of this conglomeratic member within the Vanivilas Formation, the lowest formation of the Chitradurga Group of the Neoarchean Dharwar Supergroup, is exposed in a 543 m-thick measured section. It is in a sub-vertical attitude, is highly sheared, and has undergone greenschist facies metamorphism. The diamictites had an original matrix of laminated mud/silt and fine sand. While including diamictites throughout, the Talya is a fining-upward sequence with intercalated sandstones dominant in its lower portion and mudstones dominant in its upper portion. We interpret that the Talya Conglomerate was deposited in a marine environment, with diamictites composed of ice-rafted detritus (IRD) deposited from icebergs calved from tidewater glacier tongues and/or possibly from ice shelves. In these 'rainout diamictites', the larger clasts were dropped into fine-grained bottom sediment deposited by sediment plumes and currents. The source ice sheet was located to the west and southwest on a land mass that included the older than 2720 Ma Bababudan Group of quartzites and mafic volcanics and older than 3000 Ma basement of granitic/gneissic rocks. Application of Walther's law indicates that the mudstone-bearing portion of the Talya was deposited upon the sandstone-bearing portion as the sea further inundated the land mass due to glacial retreat and a decrease in glacial mass, thereby resulting in the fining-upward nature of the Talya Conglomerate. We also interpret the lower portion of the Kaldurga Conglomerate, located 50-75 km to the southwest of the Talya, to be equivalent with the Talya. The Kaldurga contains mostly granitic basement detritus, perhaps exposed due to basement uplift related to isostatic rebound caused by glacial melting or due to tectonism related to westward subduction.
机译：与2700 Ma Talya砾岩相似，它由15个铁矾土（即基质支撑的砾岩）与泥岩和砂岩单元互层而成，被解释为冰川海洋沉积物。瓦尼维拉斯地层中的这个砾岩体的整个厚度，是新archarean Dharwar超群的奇特拉杜尔加群的最低地层，被暴露在一个543 m厚的实测断面中。它处于亚垂直状态，剪切力强，并且经历了绿片岩相变质作用。硅藻土具有层压泥/粉砂和细砂的原始基质。塔利亚（Talya）虽然遍及整个地层均含有铁矾土，但呈细化向上的顺序，下部为插层砂岩，上部为泥岩。我们认为Talya砾岩沉积物是在海洋环境中沉积的，由从潮水冰川舌头和/或可能从冰架上割下的冰山沉积的浮冰碎屑（IRD）组成的铁矾土。在这些“雨水的铁矾土”中，较大的碎屑掉入由沉积物羽流和洋流沉积的细颗粒底部沉积物中。源冰盖位于西部和西南部的一块土地上，包括年龄大于2720 Ma的Bababudan组石英岩和镁铁质火山岩以及年龄大于3000 Ma的花岗岩/片麻岩基底。沃尔瑟定律的应用表明，随着海面由于冰川退缩和冰川质量下降而进一步淹没陆地，塔利亚的泥岩部分被沉积在砂岩部分上，从而导致塔利雅的细化向上性质。塔利亚大企业集团。我们还解释了Kaldurga砾岩的下部，它位于塔利亚（Talya）西南50-75公里处，与塔利亚相当。 Kaldurga主要含有花岗岩基底碎屑，可能由于与冰川融化引起的等静压回弹有关的基底隆起或与向西俯冲有关的构造作用而暴露出来。

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