Geodynamic evolution of the Tethyan lithosphere as recorded in the Spontang Ophiolite, South Ladakh ophiolites (NW Himalaya, India)
نویسندگان
چکیده
The Spontang Ophiolite complex represents the most complete ophiolite sequence amongst South Ladakh ophiolites and comprises mantle rocks (depleted harzburgites, dunites minor lherzolites) as well crustal (basalt, isotropic gabbros, layered gabbros etc.). In present study, detailed geochemistry (whole rock mineral chemistry) Sr-Nd isotopic analyses of thirty-six ultramafic- mafic samples have been attempted to constraint evolution petrogenetic history Tethyan oceanic crust. Major, trace-element REE patterns peridotites their minerals indicate that lherzolites experienced lower degrees partial melting resembling abyssal (at higher temperatures, TREE = ∼1216 °C) than harzburgites (6%–8% versus 15%–17%). Elevated εNd(t) variable 87Sr/86Sr(t) ratios along with suggest display N-MORB affinity negligible participation sediments in genesis are originated from a depleted upper little contribution subduction-related fluids. MORB-type Neotethyan crust is associated earliest phase subduction (of older Jurassic age) through which younger intra-oceanic island arc (Spong arc) subsequently developed. Harzburgites typical U-shaped patterns, suggesting these metasomatized by LREE-enriched On other side, characterized heterogeneous (Nb/La)PM (Hf/Sm)PM relatively homogeneous εNd(t), indicating interaction melts during initiation subduction, Early Cretaceous times.
منابع مشابه
Proterozoic crustal evolution in the NW Himalaya (India) as recorded by circa 1.80 Ga mafic and 1.84 Ga granitic magmatism
Single zircon dating of the Rampur metabasalts of the Larji–Kullu–Rampur window in the Lesser Himalayas yielded an evaporation age of 1800913 Ma. The zircon age is considerably younger than the previously published whole rock Sm–Nd age of 2510990 Ma, suggesting that the Sm–Nd age may be geologically meaningless and that the Sm–Nd whole rock array may have resulted from mixing. In the NW Himalay...
متن کاملTectonic evolution of the Khoy ophiolitic complex, NW Iran
The Khoy Ophiolitic Complex (KOC) as a part of Tethyan, Izmir-Ankara- Erzincan and Bitlis-Zagros sutures of South East (SE) Turkey is broadly exposed around Khoy region (NW Iran). This complex comprises dismembered fragments of mantle lithosphere, obducted oceanic lithosphere and parts of volcanic arc remnants. The Khoy Ophiolitic Complex can be structurally divided into two major eastern and w...
متن کاملHybridization of granitic magmas in the source: The origin of the Karakoram Batholith, Ladakh, NW India
متن کامل
formation and evolution of regional organizations: the case study of the economic cooperation organization (eco)
abstract because of the many geopolitical, geo economical and geo strategically potentials and communicational capabilities of eco region, members can expand the convergence and the integration in base of this organization that have important impact on members development and expanding peace in international and regional level. based on quality analyzing of library findings and experts interv...
15 صفحه اولAnomalously fast convergence of India and Eurasia caused by double subduction
Before its collision with Eurasia1–5, the Indian Plate moved rapidly, at rates exceeding 140mmyr−1 for a period of 20 million years1,3–7. This motion is 50 to 100% faster than the maximum sustained rate of convergence of themain tectonic plates today8. The cause of such high rates of convergence is unclear and not reproduced by numerical models9,10. Here we show that existing geological data11,...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Geoscience frontiers
سال: 2022
ISSN: ['2588-9192', '1674-9871']
DOI: https://doi.org/10.1016/j.gsf.2021.101297