Multistage orthopyroxene formation in ultrahigh-temperature granulites of Ganguvarpatti, southern India: implications for complex metamorphic evolution during Gondwana assembly

被引:53
|
作者
Tamashiro, I
Santosh, M
Sajeev, K
Morimoto, T
Tsunogae, T
机构
[1] Kochi Univ, Fac Sci, Kochi 7808520, Japan
[2] Chonbuk Natl Univ, Basic Sci Res Inst, Chonju 561756, South Korea
[3] Univ Tsukuba, Inst Geosci, Tsukuba 3058571, Japan
关键词
D O I
10.2465/jmps.99.279
中图分类号
P57 [矿物学];
学科分类号
070901 ;
摘要
Orthopyroxene-sillimanite-quartz granulites of Ganguvarpatti (GVP) from the northern Madurai Block in southern India record ultrahigh-temperature (UHT) metamorphism and complex exhumation history. Orthopyroxenes in different textural setting in the GVP rocks shows marked variation in Al2O3 and X-Mg contents. Inclusions, cores of porphyroblasts and some of the discrete grains in the matrix possess the highest Al2O3 contents (8.5-9.4 wt%). Orthopyroxenes occurring as fine to medium grained symplectitic intergrowths with cordierite show Al2O3 values ranging from 7.6-8.2 wt%. Those which form symplectites with sapphirine have intermediate Al2O3 values (6.9-7.5 wt%) while orthopyroxenes associated with spinel possess values between 7.3-7.5 wt%. Late orthopyroxene rim on biotite shows the lowest Al2O3 range between 5.9-6.5 wt%. Orthopyroxenes from various textural associations define distinct P-T slots in the Al in orthopyroxene thermometry based on the X-Mg-X-Al isopleths. Thus, orthopyroxene porphyroblasts and inclusions yield temperatures around 1050 degrees C and pressure above 10 kbar. Orthopyroxene composition in orthopyroxene-cordierite symplectite yields temperatures of 950-990 degrees C at pressure above 8 kbar and those associated with sapphirine and spinel symplectites show 850-900 degrees C at a pressure around 8 kbar. The late orthopyroxene rim around biotite yields temperatures around 850 degrees C at 6 kbar. The UHT conditions attained by these rocks are also corroborated by garnet-orthopyroxene thermometry, which provides an upper estimate of 1050 +/- 50 degrees C. The GVP rocks preserve a series of mineral reactions indicating ultrahigh-temperature decompression. The reaction textures when evaluated in KFMASH petrogenetic grid indicate two stages of isobaric cooling and decompression, suggesting a complex exhumation history. The textures and mineral reactions observed in this study in conjunction with the available age data suggest that the multistage exhumation of the UHT rocks in Ganguvarpatti could be related to the orogenic events involving continent collision, crustal thickening and extensional collapse accompanying the step-wise suturing of Gondwana supercontinent during the late Neoproterozoic.
引用
收藏
页码:279 / 297
页数:19
相关论文
共 50 条
  • [31] Metamorphic evolution of high-pressure and ultrahigh-temperature granulites from the Alxa Block, North China Craton: Implications for the collision and exhumation of Paleoproterozoic orogenic belts
    Zou, Lei
    Guo, Jing-Hui
    Zhang, Li-Fei
    Huang, Guang-Yu
    Jiao, Shu-Juan
    Tian, Zhong-Hua
    Liu, Ping-Hua
    GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2024, 136 (7-8) : 3103 - 3120
  • [32] A MULTISTAGE PRESSURE-TEMPERATURE RECORD IN THE CHILKA LAKE GRANULITES - THE EPITOME OF THE METAMORPHIC EVOLUTION OF EASTERN GHATS, INDIA
    SEN, SK
    BHATTACHARYA, S
    ACHARYYA, A
    JOURNAL OF METAMORPHIC GEOLOGY, 1995, 13 (02) : 287 - 298
  • [33] Ultrahigh-temperature metamorphism of garnet-sillimanite-bearing pelitic granulites in Yushugou, Southern Tianshan, Xinjiang, and tectonic implications
    Jing, Yanqing
    Tong, Laixi
    Liu, Zhao
    Li, Chao
    ACTA PETROLOGICA SINICA, 2025, 41 (01) : 215 - 236
  • [34] Neoarchean ultrahigh-temperature sapphirine granulites from the Karimnagar Granulite Terrane, Southern India: Implications for hot orogen along the Eastern Dharwar Craton margin
    Sundaralingam, K.
    Uthup, Sam
    Tsunogae, Toshiaki
    Renjith, M. L.
    Sahu, Munesh K.
    LITHOS, 2021, 406-407
  • [35] Petrology, phase equilibria modelling, and in situ zircon and monazite geochronology of ultrahigh-temperature granulites from the khondalite belt of southern India
    Yu, Bing
    Santosh, M.
    Li, Shan-Shan
    Shaji, E.
    LITHOS, 2019, 348
  • [36] Ultrahigh-temperature metamorphism (1150°C, 12 kbar) and multistage evolution of Mg-, Al-rich granulites from the central Highland Complex, Sri Lanka
    Sajeev, K
    Osanai, Y
    JOURNAL OF PETROLOGY, 2004, 45 (09) : 1821 - 1844
  • [37] First report of sapphirine plus quartz assemblage from southern India: Implications for ultrahigh-temperature metamorphism
    Tateishi, K
    Tsunogae, T
    Santosh, M
    Janardhan, AS
    GONDWANA RESEARCH, 2004, 7 (04) : 899 - 912
  • [38] Sulfide evolution in high-temperature to ultrahigh-temperature metamorphic rocks from Lutzow-Holm Complex, East Antarctica
    Kawakami, T.
    Ellis, D. J.
    Christy, A. G.
    LITHOS, 2006, 92 (3-4) : 431 - 446
  • [39] Ultrahigh-temperature metagabbros from Wynad: Implications for Paleoproterozoic hot orogen in the Moyar Suture Zone, southern India
    Yano, Minami
    Tsunogae, Toshiaki
    Santosh, M.
    Yang, Qiong-Yan
    Shaji, E.
    Takamura, Yusuke
    JOURNAL OF ASIAN EARTH SCIENCES, 2016, 130 : 139 - 154
  • [40] Paleoproterozoic emplacement and Cambrian ultrahigh-temperature metamorphism of a layered magmatic intrusion from the Central Madurai Block, southern India: From Columbia to Gondwana
    Bing Yu
    MSantosha
    MingXian Wang
    ChengXue Yang
    Geoscience Frontiers, 2022, (01) : 34 - 51