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首页> 外文期刊>Precambrian Research >Characteristics, origin and significance of Mesoproterozoic bedded clastic facies at the Olympic Dam Cu-U-Au-Ag deposit, South Australia
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Characteristics, origin and significance of Mesoproterozoic bedded clastic facies at the Olympic Dam Cu-U-Au-Ag deposit, South Australia

机译：南澳大利亚奥林匹克大坝Cu-U-Au-Ag矿床中元古界层状碎屑相的特征，成因及意义

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Mesoproterozoic bedded clastic facies occur in the Olympic Dam Breccia Complex which hosts the Olympic Dam Cu-U-Au-Ag deposit, South Australia. Contacts of the bedded clastic facies with breccia of the Olympic Dam Breccia Complex are faulted and/or brecciated; fragments of the bedded clastic facies occur in the breccia complex. The bedded clastic facies comprise five main facies associations, four of which are organised into mappable units. These associations have distinct textures and components and have not been mixed. Major sources of detritus were felsic and mafic volcanic units and granitoids of the similar to 1590 Ma Gawler Silicic Large Igneous Province. Archean and Paleoproterozoic zircons in well-sorted quartz-rich sandstone indicate that older Gawler Craton basement successions also contributed sediment to the bedded clastic facies. Accumulation of the bedded clastic facies was at least partly contemporaneous with rhyolitic explosive eruptions from vent(s) probably tens of km away because bubble-wall shards are present in tuffaceous mudstone fades. Deformation of the bedded clastic facies prior to final lithification produced folds that have diverse shapes and sizes, and that lack cleavage. The folds have a reasonably consistent gentle plunge to the northeast. These soft-sediment folds could be related to slumping on a northeast-striking paleoslope that dipped either to the northwest or southeast. The depocenter in which these facies accumulated may have been bounded by a combination of northeast-striking and northwest striking faults. Because the bedded clastic facies occur at the top of the Olympic Dam Breccia Complex and contributed clasts to it, the fault-controlled sedimentary basin was in place when the breccia complex and the Olympic Dam ore deposit formed. (C) 2016 Elsevier B.V. All rights reserved.
机译：中古生界层状碎屑相出现在奥林匹克水坝布雷西亚综合体中，该水合物体是南澳大利亚奥林匹克水坝Cu-U-Au-Ag矿床的所在地。层状碎屑岩相与奥林匹克大坝角砾岩复合体的角砾岩接触是断层和/或角砾岩;层状碎屑相的碎片出现在角砾岩复合体中。层状碎屑相由五个主要相组成，其中四个被组织成可绘制的单元。这些关联具有明显的纹理和成分，并且没有混合在一起。碎屑的主要来源是长英质和镁铁质火山岩单元以及与1590 Ma Gawler硅质大火成岩省相似的花岗岩。在富含石英的砂岩中，优质的古宙锆石和古元古代锆石表明，较早的高勒克拉通基底地下演替也为层状碎屑岩相贡献了沉积物。层状碎屑相的堆积至少部分与大约几十公里外的喷口的流纹状爆炸性喷发同时发生，因为凝灰质泥岩衰变中存在气泡壁碎片。在最终石化之前，层状碎屑相的变形产生了褶皱，这些褶皱具有各种形状和大小，并且缺乏解理作用。褶皱向东北方向呈持续一致的轻柔倾泻。这些柔软的沉积褶皱可能与东北向或向东南倾斜的古坡崩塌有关。沉积这些相的沉积中心可能是由东北走向的断层和西北走向的断层共同限定的。由于层状碎屑相出现在奥林匹克大坝角砾岩复合体的顶部，并为其增添了碎屑，所以当角砾岩复合体和奥林匹克大坝矿床形成时，断层控制的沉积盆地就位。 （C）2016 Elsevier B.V.保留所有权利。

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