高勒克拉通北部埋藏的片麻岩穹丘:澳大利亚新生代南部中新生代早期(约 1600-1560 Ma)延伸的记录

IF 3.5 2区 地球科学 Q1 GEOLOGY
Jie Yu, Martin Hand, Laura J. Morrissey, Justin L. Payne
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引用次数: 0

摘要

位于高勒克拉通北部的梅布尔溪山脊是一个花岗岩成因区,记录了中新生代早期的变质作用,两侧是变质程度较低的岩石,并被地壳规模的分异构造所分割。由于缺乏基底露头,人们对中新生代早期事件的性质知之甚少。计算的变质相图和地质年代学被用来解读潜在片麻岩穹隆的构造体系。对来自梅布尔溪山脊五个钻孔的玄武岩进行的压力-温度(P-T)建模表明,它经历了大约 6.4-7.4 千巴和 800-850°C 的条件,石榴石之后的超固结堇青石的生长表明了随后的减压。原位U-Pb独居石和Lu-Hf石榴石地质年代学将马贝尔溪山脊的花岗岩成因变质作用推定为约1600-1560Ma。与此相反,位于马贝尔溪山脊北部的 GOMA DH4 号钻孔记录了约 1520 Ma 时的 2.2-5.4 kbar 和 710-740°C 的条件,没有证据表明该地区发生了变质作用。1520Ma,没有1600-1560Ma变质作用的证据。我们从梅布尔溪山脊和邻近地壳获得的新的P-T假吸积结果和地质年代数据,以及区域地震和机载磁性数据,揭示了梅布尔溪山脊代表了高勒克拉通中新生代早期延伸的记录,在这一时期,受到热扰动的下地壳岩石在片麻岩穹隆内被掘出。中新生代早期的延伸发生在一个复杂的地球动力机制中,该机制是由澳大利亚东北部边缘的努纳最终辐合(约1600Ma)与澳大利亚东北部边缘的俯冲相互作用而形成的。1600 Ma时沿澳大利亚东北部边缘的最终努纳辐合和约1630-1610 Ma时向西南部的俯冲的相互作用。1630-1610 Ma.
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A buried gneiss dome in the northern Gawler Craton: The record of early Mesoproterozoic (ca. 1600–1560 Ma) extension in southern Proterozoic Australia

A buried gneiss dome in the northern Gawler Craton: The record of early Mesoproterozoic (ca. 1600–1560 Ma) extension in southern Proterozoic Australia

Mabel Creek Ridge, in the northern Gawler Craton, is a granulite-facies domain recording early Mesoproterozoic metamorphism, flanked by less metamorphosed rocks and dissected by crustal-scale divergent structures. The nature of early Mesoproterozoic events is poorly understood due to the lack of basement outcrop. Calculated metamorphic phase diagrams and geochronology are used to decipher the tectonic regime of a potential gneiss dome. Pressure–temperature (P–T) modelling of metapelites from five drill holes across Mabel Creek Ridge suggests it has experienced conditions of ~6.4–7.4 kbar and 800–850°C and the growth of suprasolidus cordierite after garnet indicates subsequent decompression. In situ U–Pb monazite and Lu–Hf garnet geochronology constrains the granulite-facies metamorphism of Mabel Creek Ridge to ca. 1600–1560 Ma. In contrast, drill hole GOMA DH4 located to the north of Mabel Creek Ridge records conditions of 2.2–5.4 kbar and 710–740°C at ca. 1520 Ma, with no evidence for 1600–1560 Ma metamorphism. Our new P–T pseudosection results and geochronology data from Mabel Creek Ridge and adjacent crust, coupled with the regional seismic and airborne magnetic data, reveal that Mabel Creek Ridge represents a record of early Mesoproterozoic extension in the Gawler Craton, during which thermally perturbed lower crustal rocks were exhumed within a gneiss dome. Early Mesoproterozoic extension took place within a complex geodynamic regime resulting from the interplay between final Nuna convergence along the margin of northeast Australia at ca. 1600 Ma and subduction to the southwest at ca. 1630–1610 Ma.

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来源期刊
CiteScore
6.60
自引率
11.80%
发文量
57
审稿时长
6-12 weeks
期刊介绍: The journal, which is published nine times a year, encompasses the entire range of metamorphic studies, from the scale of the individual crystal to that of lithospheric plates, including regional studies of metamorphic terranes, modelling of metamorphic processes, microstructural and deformation studies in relation to metamorphism, geochronology and geochemistry in metamorphic systems, the experimental study of metamorphic reactions, properties of metamorphic minerals and rocks and the economic aspects of metamorphic terranes.
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