By Naresh Chandra Ghose, Nilanjan Chatterjee, Fareeduddin
The ebook is a considerate dialogue with scientists learning convergent plate limitations resembling the well known, energetic India-Eurasia collision area. It offers a finished choice of petrographic photos of ophiolitic rocks exhumed from oceanic lithosphere and mantle on the India-Asia plate boundary. Ophiolite is uncovered within the northwestern Himalayas, jap Indian plate margin and Andaman-Nicobar Islands. on the jap margin, it happens in a slim strip comprising mantle peridotite tectonite, cummulate peridotite-gabbro-plagiogranite-anorthosite, mafic dyke, volcanics and oceanic sediments. Low temperature/high strain rocks together with blueschists and eclogites have been widely studied lately. Ophiolite derived sediments and podiform chromites can also be mentioned to supply whole information. Supplemental maps, geological sections, box sketches and pictures will clarify the constitution, stratigraphy, ore mineralization, and metamorphic history.
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Additional info for A Petrographic Atlas of Ophiolite: An example from the eastern India-Asia collision zone
2007) are located east of the Andaman Islands along the eastern arc that continues southeastward through the Java–Sumatra volcanic chain, and northward into Myanmar where several extinct volcanoes such as Mt Popa and Mt Taungthonlon (MioceneQuaternary) are found. A back-arc basin exists further east of the Andaman Arc, where the sea floor is spreading from several ENE–WSW ridge segments offset by several N–S right-lateral strike-slipfaults since c. 4 Ma (Raju et al. 2004; Curray 2005). The N–S strike-slip faults are part of an extensive horsetail structure at the southern end of the Sagaing fault of Myanmar (Maurin and Rangin 2009).
Olivine inclusions in pyroxene, minor euhedral spinel. • Recrystallised, interstitial olivine around clinopyroxene, olivine ? clinopyroxene symplectite around orthopyroxene, orthopyroxene ? spinel symplectite and vermicular spinel: melt-rock interactions. • Minor chlorite, actinolite, carbonate and prehnite: secondary alteration and metasomatism. Gabbro: • Plagioclase altered to albite ? prehnite, clinopyroxene replaced by metamorphic green amphibole or minor chlorite: low-temperature metamorphism.
Lithos 125:347–367 22 Bhattacharjee CG (1991) The ophiolites of northeast India—a subduction zone ophiolite complex of the Indo-Burman orogenic belt. Tectonophysics 191:213–222 Bouilhol P, Burg JP, Bodinier JL, Scmidt MW, Dawood H, Hussain S (2009) Magma and fluid percolation in arc to forearc mantle: evidence from Sapat (Kohistan, Northern Pakistan). Lithos 107:17–37 Brunnschweiler RO (1966) On the geology of the Indoburman ranges. J Geol Soc Aust 11:117–194 Burg JP, Nievergelt P, Oberli F, Seward D, Davy P, Maurin JC, Diao ZZ, Meier M (1998) The Namche Barwa syntaxis: evidence for exhumation related to compressional crustal folding.
A Petrographic Atlas of Ophiolite: An example from the eastern India-Asia collision zone by Naresh Chandra Ghose, Nilanjan Chatterjee, Fareeduddin