古新生代凯特花岗岩套件为坦桑尼亚克拉通和邦圭卢地块组装过程中的板块断裂提供了证据

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of African Earth Sciences Pub Date : 2024-10-15 DOI:10.1016/j.jafrearsci.2024.105448
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引用次数: 0

摘要

在哥伦比亚超大陆周期产生刚果克拉通的古新生代埃伯恩造山运动期间,形成了乌本迪安-乌萨卡兰带。在这一地球动力学过程中,大量 1.80-1.90 Ga 的元古宙和火山岩侵入了邦圭卢地块边缘和乌本迪安-乌萨卡兰带。近年来的研究表明,乌本迪安-乌萨加兰带(坦桑尼亚克拉通一侧)出露的大面积 1.90-1.80 Ga 热成岩-火山岩套件是由区域热异常引起的大范围地壳膨胀造成的。然而,加热机制仍不清楚。在另一侧(班圭卢地块),在西乌本迪安走廊和班圭卢地块边界上出现的共生凯特-基皮利长英岩组的高精度年代学和地球化学数据十分稀少。该岩组的成因和构造背景颇具争议,但对于了解古近纪乌本底造山运动期间的地壳演化却至关重要。为了解决这个问题,本文重点研究了凯特花岗岩的岩石成因和构造背景。凯特花岗岩新的LA-ICPMS锆石U-Pb年龄显示了1.87至1.90 Ga的岩浆活动。从地球化学角度看,凯特花岗岩属于镁质碱钙岩系列。它们表现出独特的特征,包括高Ga/Al和K2O/Na2O;高浓度的Nb、Ta、Zr和Y;以及低Eu、Sr、Cr、Co和Ni。根据地球化学特征,凯特花岗岩至少可分为两类,即A2型花岗岩和板块崩塌柱状岩。凯特-基皮利复合体被认为与板块断裂过程有关,板块崩塌岩浆活动与 A 型岩浆活动的主要区别可能在于岩浆源的深度。板块断裂是坦桑尼亚西南部和邦圭卢区块在 1.90-1.80 Ga 发生岩浆侵入和火山活动的最可能机制。
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Palaeoproterozoic Kate granitoid suite provides evidence for slab break-off during the assembly of the Tanzania Craton and Bangweulu Block
The Archean Tanzania Craton and the Bangweulu Block are separated by the Ubendian-Usagaran Belt, which developed during the Palaeoproterozoic Eburnean orogeny that produced the Congo Craton during the Columbia Supercontinent Cycle. Voluminous 1.80–1.90 Ga metagranitoids and volcanics were intruded both on the edge of the Bangweulu Block and in the Ubendian-Usagaran Belt in response to this geodynamic process. In recent years, research revealed that the extensive 1.90–1.80 Ga plutonic-volcanic suites exposed in the Ubendian- Usagaran Belt (on the Tanzania Craton side) resulted from widespread crustal anatexis caused by a regional thermal anomaly. However, the heating mechanism remains unclear. On the other (Bangweulu Block) side, high-precision chronological and geochemical data for the coeval Kate-Kipili felsic suite which crops out on the boundary of the Western Ubendian Corridor and the Bangweulu Block are scarce. The origin and tectonic setting of this suite are controversial, but crucial to understanding the crustal evolution during the Paleoproterozoic Ubendian orogeny. To address this issue, this paper is focused on the petrogenesis and tectonic setting of the Kate granitoids. New LA-ICPMS zircon U-Pb ages of the Kate granitoids revealed magmatic episodes from 1.87 to 1.90 Ga. Geochemically, the Kate granitoids belong to the magnesian alkalic-calcic rock series. They exhibit distinctive features including high Ga/Al and K2O/Na2O; high concentrations of Nb, Ta, Zr, and Y; and low Eu, Sr, Cr, Co, and Ni. The Kate granitoids could be classified into at least two groups in terms of geochemical characteristics, namely A2-type granites and slab failure plutons, respectively. The Kate-Kipili complex is considered to be related to the process of slab break-off, and the main difference between slab failure magmatism and A-type magmatism is probably the depth of the magma source. Slab break-off is the most likely mechanism for the magmatic intrusions and volcanism that occurred at 1.90–1.80 Ga in SW Tanzania and the Bangweulu Block.
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来源期刊
Journal of African Earth Sciences
Journal of African Earth Sciences 地学-地球科学综合
CiteScore
4.70
自引率
4.30%
发文量
240
审稿时长
12 months
期刊介绍: The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.
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