MINERAL CHEMISTRY OF MANTLE PERIDOTITES FROM LOGHAR OPHIOLITE (SOUTHWEAST OF KABUL - AFGHANISTAN)

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NAZARI GHOLAMHOSSEIN; TORABI GHODRAT; KHALILI MAHMOUD

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Journal: PETROLOGY Year:2011 | Volume:2 | Issue:5 Page(s): 19-48

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Title

MINERAL CHEMISTRY OF MANTLE PERIDOTITES FROM LOGHAR OPHIOLITE (SOUTHWEAST OF KABUL - AFGHANISTAN)

Author(s)

NAZARI GHOLAMHOSSEIN | TORABI GHODRAT | KHALILI MAHMOUD | Issue Writer Certificate

Keywords

LOGHAR OPHIOLITEQ2

MANTLE PERIDOTITEQ2

EOCENEQ2

AFGHANISTANQ2

Abstract

The LOGHAR OPHIOLITE is located in ophiolitic belt of Kabul block (southeast of AFGHANISTAN) and it is a part of Neotethyan ophiolites in Alpine - Himalayan orogenic system with EOCENE age. Olivine, orthopyroxene, clinopyroxene and spinel are rock forming minerals of LOGHAR OPHIOLITE MANTLE PERIDOTITE. Most of the olivines from different rock types are serpentinized but some fresh are present with forsterite composition. Orthopyroxene and clinopyroxene are enstatite (Mg# 0.961-0.972) and diopside (Mg# 0.976-0.999) in composition. The Cr# of vermicular and unhedral spinels of lherzolite and subhedral reddish brown spinels of harzburgite are 0.547 and 0.625 respectively. The Cr# of subhedral to euhedral spinels of dunite is 0.477, induced by high content of Al2O3 and low level of Cr2O3. The Cr# of dark red and euhedral spinel of chromitite is 0.633. The peridotites of the studied area belong to sub-oceanic crust mantle. The low content of Al2O3 in pyroxenes (opx and cpx) and the low amount of Na2O in clinopyroxene indicate high degree of partial melting of MANTLE PERIDOTITEs. The chemical compositions of minerals in dunites are different from that of lherzolite and harzburgite but present considerable similarity with that of the pillow lavas. The dunites of Loghar MANTLE PERIDOTITE (LMP) do not share features with those derived by partial meltiny, but represent sub lithospheric melt channels.

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References

APPLICATION OF MINERAL AND WHOLE ROCK ANALYSIS IN IDENTIFICATION OF PETROGENESIS OF THE PILLOW LAVAS IN THE NAIN OPHIOLITE

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APA: Copy

NAZARI, GHOLAMHOSSEIN, TORABI, GHODRAT, & KHALILI, MAHMOUD. (2011). MINERAL CHEMISTRY OF MANTLE PERIDOTITES FROM LOGHAR OPHIOLITE (SOUTHWEAST OF KABUL - AFGHANISTAN). PETROLOGY, 2(5), 19-48. SID. https://sid.ir/paper/197076/en

Vancouver: Copy

NAZARI GHOLAMHOSSEIN, TORABI GHODRAT, KHALILI MAHMOUD. MINERAL CHEMISTRY OF MANTLE PERIDOTITES FROM LOGHAR OPHIOLITE (SOUTHWEAST OF KABUL - AFGHANISTAN). PETROLOGY[Internet]. 2011;2(5):19-48. Available from: https://sid.ir/paper/197076/en

IEEE: Copy

GHOLAMHOSSEIN NAZARI, GHODRAT TORABI, and MAHMOUD KHALILI, “MINERAL CHEMISTRY OF MANTLE PERIDOTITES FROM LOGHAR OPHIOLITE (SOUTHWEAST OF KABUL - AFGHANISTAN),” PETROLOGY, vol. 2, no. 5, pp. 19–48, 2011, [Online]. Available: https://sid.ir/paper/197076/en

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