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Geomorphic provinces and regolith-landform evolution of the Capricorn Orogen, Western Australia
Australian Journal of Earth Sciences ( IF 1.2 ) Pub Date : 2021-01-21 , DOI: 10.1080/08120099.2021.1848923
R. L. Thorne 1 , S. C. Spinks 1 , R. R. Anand 1
Affiliation  

Abstract

This study characterises the variation in regolith-landform environments and associated regolith materials in the Capricorn Orogen of Western Australia. Four different geomorphic provinces were identified based on regolith-landform characteristics. The Crystalline Basement Province in the west of the region covers an area of ∼35 000 km2, thin lithosols dominate, and granitic tors are common in a dissected landscape, and the soil composition reflects the underlying substrate. The Deeply Weathered Province, which is found in the southeast of the Capricorn Orogen, covers ∼5000 km2 and is defined by thick saprolite developed over both sediments and volcanic rocks. Ferruginous nodules and pisoliths are present at the surface and weathering profiles capped by duricrust are common. Thick (up to 100 m) paleochannel sequences, found throughout the area, are represented by mottled clays and sands. The Lowland Basin and Upland Basin provinces encompass the central and northern areas of the orogen and represent an area of ∼75 000 km2. The Upland Basin Province regions are highly dissected by valleys and include several generations of ferruginous pisoliths and nodules, ferricrete, silcrete and calcrete developed in colluvium and alluvium. Paleochannel sediments are commonly located on the flanks of hills and as low mounds and hills formed after topographic inversion. The Lowland Basin Province regions are dominated by hardpan, groundwater calcrete, and colluvial and alluvial plains below low hills on which basin sediments are exposed. These provinces provide the basis for further detailed regolith mapping across the region and can assist in guiding the choice of surface sample media for geochemical exploration. The regolith present in each province can be used to evaluate the landform evolution of the region over the past approximately 250 million years and assess relative regolith ages.

  1. KEY POINTS
  2. Four different geomorphic provinces have been identified in the Capricorn Orogen, Western Australia.

  3. The evolution of regolith landforms present in the Capricorn Orogen can be used to assess relative regolith ages.

  4. The geomorphic provinces defined within the Capricorn Orogen can be used as a basis for further regolith mapping and to assist in the choice of surface geochemical samples for mineral exploration.



中文翻译:

西澳大利亚州摩ri座造山带的地貌省份和re石形态演化

摘要

这项研究的特点是在西澳大利亚的摩Or造山带中,go石-地形环境和相关的go石材料的变化。根据re石地形特征,确定了四个不同的地貌省。该地区西部的地下室结晶省占地约35,000 km 2,稀薄的石质溶胶占主导地位,并且在被解剖的景观中花岗岩花岗很常见,土壤成分反映了下层的基底。位于摩ri座造山带东南的深风化省占地约5000 km 2由沉积物和火山岩上形成的厚腐泥土定义。表面存在铁质结节和异晶石,并且被硬铁粉覆盖的风化剖面很常见。遍布整个地区的厚(长达100 m)古河道序列以斑驳的粘土和沙子为代表。低地盆地和高地盆地省份覆盖了造山带的中部和北部,面积约7.5万公里2。。高地流域省地区被山谷高度地分割,包括几代含铁的石料和结核,在冲积层和冲积层中发育的铁质,铁质,硅质和钙质。古河道沉积物通常位于丘陵的侧面,地形反转后形成为低丘和丘陵。低地盆地省的地区以硬底,地下水凝结层和低丘陵以下的冲积平原为主,盆地沉积物暴露在低丘陵以下。这些省份为在该地区进行进一步详细的碎屑岩测绘提供了基础,并且可以协助指导地球化学勘探的地表样品介质的选择。

  1. 关键点
  2. 在西澳大利亚的摩ri座造山带中已经确定了四个不同的地貌省。

  3. 摩ri座造山带中存在的长石地貌的演化可用于评估相对长石的年龄。

  4. 摩ri座造山带内定义的地貌省可以用作进一步重碎屑测绘的基础,并有助于选择地表地球化学样品进行矿物勘探。

更新日期:2021-01-21
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