The Coompana Province, located between the three cratonic blocks of Australia, is significant for understanding the Proterozoic assembly of the continent. However, the basement rocks are completely covered and poorly understood, and as a result reconstructions are poorly constrained. Recent collection of detailed geophysical data sets and a stratigraphic drilling campaign in the eastern Coompana Province is used to understand the crustal architecture and tectonomagmatic history of the region. A north to northeast trending grain represents a series of amalgamated 1618–1526 Ma tectonic belts between the Western and South Australian cratons. These belts are cut by a northeast trending, shear‐bounded corridor of thinned crust, intruded by voluminous circa 1150–1140 Ma granite plutons. The new data indicate two main stages of deformation between circa 1200 and 1140 Ma. Circa 1200–1170 Ma east‐west extension was pervasive, causing widespread partial melting, shallowly dipping layering, recumbent folding, and minor shoshonitic magmatism. Circa 1160–1140 Ma deformation was partitioned into the northeast trending corridor, which focused transfer and emplacement of voluminous A‐type magmas. The two stages represent a switch from pervasive to localized deformation, with accompanying changes in magmatic style. Early pervasive extension caused progressive melt extraction, producing small sheets. Subsequent shearing locally promoted melt reorganization in the lower and middle crust. This caused local changes in rock strength with the continued partitioning of deformation into the oblique corridor. The crustal‐scale structures disrupted the lower crustal MASH zones, mobilizing and focusing the voluminous magmatism.

中文翻译：

---

澳大利亚库姆帕纳省地壳构造，变形与岩浆作用之间的关系

库姆帕纳省位于澳大利亚的三个克拉通块之间，对于了解该大陆的元古界具有重要意义。但是，地下室的岩石被完全覆盖并且了解甚少，因此重建工作受到的约束也很有限。最近在库姆帕纳省东部收集了详细的地球物理数据集和地层钻探活动，以了解该地区的地壳构造和构造构造历史。从北到东北的趋势谷物代表了西澳大利亚和南澳大利亚克拉通之间的一系列1618–1526 Ma构造带。这些带被东北趋势的，以剪力为边界的稀薄地壳剪断，并被大约1150–1140 Ma花岗岩岩体侵入。新数据表明，在1200到1140 Ma之间有两个主要的变形阶段。大约在1200-1170 Ma东西向延伸是普遍的，引起广泛的部分熔融，浅层地层，斜卧褶皱和少量的岩浆岩浆作用。大约在1160年至1140年间，Ma变形被划分为东北趋势走廊，该走廊集中了大量A型岩浆的转移和安置。这两个阶段代表了从普遍变形到局部变形的转变，伴随着岩浆样式的变化。早期的广泛延伸导致逐渐的熔体抽出，从而产生小薄片。随后的剪切局部促进了下地壳和中地壳的熔体重组。随着变形的持续分配到倾斜的走廊，这导致了岩石强度的局部变化。