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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 >The Lomati Delta Complex: A prograding tidal delta in the Archean Moodies Group, Barberton Greenstone Belt
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The Lomati Delta Complex: A prograding tidal delta in the Archean Moodies Group, Barberton Greenstone Belt

机译：Lomati Delta Complex：Barberton Greenstone Belt的Archean Moodies Group中的一个促进潮汐三角洲

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摘要

Archean terrestrial-marine transitional strata provide insights in early-Earth coastal-zone dynamics and the onset of land colonization but are exceedingly rare. We here present results of detailed mapping, stratigraphic and petrographic analysis, and age dating of the Lomati Delta Complex, a morphologically prominent, wedge-shaped and dominantly arenaceous unit in the middle Moodies Group (~3.22 Ga) of the central Barberton Greenstone Belt (BGB). Subvertical regional bedding allows cross-sectional correlation within a prograding delta complex from proximal coarse-grained coastal-plain-facies sandstones to stratigraphically equivalent fine-grained and rhythmic prodelta siltstones over ca. 7 km strike length. Several reworked, subaerially exposed delta-top units mark sudden flooding events preceding progradational pulses. Microbial mats densely colonize shallow-marine facies. The provenance of detrital zircon grains and the feldspathic character of the sediments point to a proximal source comprising magmatic rocks formed mainly at 3.24, 3.28, 3.43 and 3.54 Ga within the BGB. The Lomati Delta Complex likely formed in a narrow, tide-dominated basin in which sedimentary systems quickly responded to changes in basin geometry, nearby source region uplift, and sediment supply.
机译：Archean地面海洋过渡地层提供早期沿海区域动态的见解和土地殖民的发作，但非常罕见。我们在这里展示详细的映射，地层和岩体分析，以及Lomati Delta复合物的年龄约会，在Carberton Greenstone Belt中央组织（〜3.22A GA）中的形态学上突出，楔形和主要的植物单位（ BGB）。复杂的区域床上用品允许在近端粗粒沿海平原砂岩的促进三角洲复合物中的横截面相关性，以在CA上分层相同的细粒度和节奏Prodelta淤泥。 7公里的罢工长度。几个重新制作，亚阶暴露的三角端单位标记了促进脉冲前的突然洪水事件。微生物垫密集地殖民浅海洋。替代锆石颗粒的出处和沉积物的沉积物的近似源，该近端源包括主要在BGB内的3.24,3.28,3.43和3.54Ga形成的岩浆岩石。 Lomati Delta复合体可能形成在狭窄的潮汐主导的盆地中，其中沉积系统迅速响应盆地几何形状的变化，附近的源区隆起和沉积物供应。

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