Paleoproterozoic amphibolite to ultrahigh temperature granulite facies metamorphism of the Rangnim massif in the Northern Korean Peninsula and tectonic implications

IF 3.2 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Precambrian Research Pub Date : 2024-11-01 DOI:10.1016/j.precamres.2024.107606
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Abstract

Three Paleoproterozoic orogenic/mobile belts were suggested for the North China Craton (NCC), which were further suggested to represent global networks of narrow plate boundaries and argue for the operation of plate tectonics during the Paleoproterozoic. However, recent studies raised serious challenges to such advocates in that the seemingly belt-like occurrences of the Paleoproterozoic high-grade terranes are related to Phanerozoic tectonic processes. The basement components and metamorphic features of the Rangnim Massif in North Korea can provide critical evidence for a thorough understanding of the tectonic implications of these high-grade terranes, because it was assumed to be an Archean microcontinent that accreted to the NCC during the Paleoproterozoic through one of the three orogenic bents. This massif was assumed to be linked to the NCC through the Jiao-Liao-Ji orogenic belt in the traditional tectonic models. In this paper, we present both new study results and a summarization of previously published data on the Rangnim Massif. The Paleoproterozoic metamorphic rocks collected from the Rangnim Massif show amphibolite to UHT granulite facies metamorphism at ∼ 1.90 Ga, with peak metamorphic conditions reaching up to 940 – 980 ℃ at 7 – 9 kbar. The Paleoproterozoic metamorphism, the widespread Paleoproterozoic sedimentary and magmatic rocks of this massif, are identical with those of the Paleoproterozoic “orogenic belts” of the NCC. Therefore, the Jiao-Liao-Ji “orogenic belt” is extendable to the Rangnim Massif, or even to the whole Korean Peninsula. The newly established spatial occurrences and the metamorphic features of these metamorphic rocks of the eastern NCC are different from those of plate margin orogenic belts. Therefore, the exact geological implications should be reconsidered and that these high-grade terranes might represent the NCC’s uplifted Paleoproterozoic lower crustal components.
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朝鲜半岛北部朗宁地块的古新生代闪长岩至超高温花岗岩变质作用及其构造影响
有人提出了华北克拉通(NCC)的三个古新生代造山/移动带,并进一步认为它们代表了全球狭窄板块边界网络,并论证了古新生代板块构造的运作。然而,最近的研究对这种观点提出了严峻的挑战,因为看似带状的古新生代高品位陆相的出现与新生代的构造过程有关。北朝鲜 Rangnim 地块的基底成分和变质特征可以为彻底了解这些高品位陆块的构造影响提供关键证据,因为它被假定为在古元古代通过三个造山拗陷之一增生到 NCC 的一个 Archean 小洲。在传统的构造模型中,该地块被假定为通过焦-辽-济造山带与北中国大陆相连。在本文中,我们既介绍了新的研究成果,也总结了以前发表的有关郎宁山丘的数据。从郎宁山地块采集到的古新生代变质岩显示,在 1.90 Ga∼1.90 Ga 处发生了闪长岩到超高温花岗岩的变质作用,变质峰值达到 940 - 980 ℃,变质条件为 7 - 9 kbar。该地块的古生代变质作用、广泛分布的古生代沉积岩和岩浆岩与国家地质公园的古生代 "造山带 "相同。因此,焦-辽-济 "造山带 "可延伸至凉林地块,甚至整个朝鲜半岛。新近确定的北大西洋公约东部变质岩的空间分布和变质特征与板块边缘造山带不同。因此,应重新考虑其确切的地质含义,这些高品位的地层可能代表了北领地隆起的古生代下地壳成分。
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来源期刊
Precambrian Research
Precambrian Research 地学-地球科学综合
CiteScore
7.20
自引率
28.90%
发文量
325
审稿时长
12 months
期刊介绍: Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.
期刊最新文献
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