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DOI | 10.1130/B35378.1 |
Extreme thermal metamorphism associated with Gondwana assembly: Evidence from sapphirine-bearing granulites of Rajapalayam, southern India | |
Li, Shan-Shan1,2; Palin, Richard M.2; Santosh, M.1,3,4; Shajis, E.5; Tsunogae, T.6,7 | |
2020-05-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2020 |
卷号 | 132期号:5-6页码:1013-1030 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA; Australia; South Korea; India; Japan; South Africa |
英文摘要 | The Madurai block is the largest composite crustal block in the Southern Granulite terrane of India, where granulite-facies rocks metamorphosed at ultrahigh-temperature (UHT) conditions occur in several localities. Here, we investigated UHT rocks from Rajapalayam, in the southern domain of the Southern Granulite terrane, using integrated thermobarometry and in situ monazite geochronology to precisely constrain the nature and timing of this extreme metamorphism and its implications for regional tectonics. Conventional thermobarometry and petrological phase equilibrium modeling reveal prograde pressure-temperature (P-T) conditions at 0.75-1.2 GPa and <900 degrees C, followed by peak/postpeak UHT metamorphism at 0.72-0.82 GPa and 1025-1050 degrees C, and retrograde reequilibration at 0.72-0.80 GPa and 875-895 degrees C. The granulites thus record a clockwise P-T path defining geothermal gradients of 1200-1500 degrees C/GPa at peak metamorphism, indicating the presence of an extreme thermal perturbation in the middle to lower continental crust. In situ monazite dating indicates prograde metamorphism at 607-585 Ma, peak metamorphism at 546-543 Ma, and retrograde cooling and exhumation at 539-483 Ma. As such, the entire tectonothermal cycle was complete within similar to 120 m.y., although temperatures exceeding 900 degrees C were likely sustained for at least 30 m.y. Such extreme thermal events preserved in geological terranes worldwide are commonly associated with lithospheric extension, although our data show that prolonged heating can occur during continental convergence instead, supporting inferences made by thermomechanical models. Thus, supercontinent formation may act as a driver for spatially distributed UHT tectonometamorphism, as shown by the episodic records in geological history. The age of peak metamorphism constrained here was synchronous with UHT metamorphism in other localities in the Southern Granulite terrane, Sri Lanka, Madagascar, and Antarctica, indicating their correlation with the final amalgamation of eastern Gondwana at ca. 550 Ma. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000530917400009 |
WOS关键词 | ULTRAHIGH-TEMPERATURE METAMORPHISM ; PLUS QUARTZ ASSEMBLAGE ; U-PB GEOCHRONOLOGY ; NEOPROTEROZOIC ARC MAGMATISM ; CALCULATED PHASE-EQUILIBRIA ; HIGH-GRADE METAMORPHISM ; NORTHERN MADURAI BLOCK ; SRI-LANKA IMPLICATIONS ; HIGHLAND COMPLEX ; HIGH-PRESSURE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/279424 |
专题 | 地球科学 |
作者单位 | 1.China Univ Geosci Beijing, Sch Earth Sci & Resources, 29 Xueyuan Rd, Beijing 100083, Peoples R China; 2.Colorado Sch Mines, Dept Geol & Geol Engn, Golden, CO 80401 USA; 3.Univ Adelaide, Ctr Tecton Explorat & Res, Adelaide, SA 5005, Australia; 4.Yonsei Univ, Yonsei Frontier Lab, Seoul 03722, South Korea; 5.Univ Kerala, Dept Geol, Kariyavattom Campus, Trivandrum 695581, Kerala, India; 6.Univ Tsukuba, Grad Sch Life & Environm Sci, Ibaraki 3058572, Japan; 7.Univ Johannesburg, Dept Geol, Auckland Pk 2006, South Africa |
推荐引用方式 GB/T 7714 | Li, Shan-Shan,Palin, Richard M.,Santosh, M.,et al. Extreme thermal metamorphism associated with Gondwana assembly: Evidence from sapphirine-bearing granulites of Rajapalayam, southern India[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2020,132(5-6):1013-1030. |
APA | Li, Shan-Shan,Palin, Richard M.,Santosh, M.,Shajis, E.,&Tsunogae, T..(2020).Extreme thermal metamorphism associated with Gondwana assembly: Evidence from sapphirine-bearing granulites of Rajapalayam, southern India.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,132(5-6),1013-1030. |
MLA | Li, Shan-Shan,et al."Extreme thermal metamorphism associated with Gondwana assembly: Evidence from sapphirine-bearing granulites of Rajapalayam, southern India".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 132.5-6(2020):1013-1030. |
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