Two-stage collision between Indian and Afghan plates: evidences from geochemical signatures | [Seventh International Conference on Earth Sciences Pakistan (ESP-2024), June 2-4, 2024 (Abstract Book) • 2024]

Author(s):

1. Hikmat Salam: Deptt. of Geology, Khushal Khan Khattak Univ., Karak, Pakistan; Deptt. of Earth Sci. & Environ, Faculty of Sci.& Tech, The National Univ. of Malaysia (UKM), Bangi, Malaysia

2. Norasiah Sulaiman: Deptt. of Earth Sci. & Environ., Faculty of Sci.& Tech., The National Univ. of Malaysia (UKM), Bangi, Malaysia

3. M. Iswadi Basril Basori: Deptt. of Earth Sci. & Environ., Faculty of Sci.& Tech., The National Univ. of Malaysia (UKM), Bangi, Malaysia;

4. Sayed Ali Turab: National Centre of Excellence in Geology, University of Peshawar, Pakistan

Abstract:

Trace elements and REEs concentration in the mafic ultramafic rocks of the dismembered units of the Waziristan ophiolites (Pakistan) were determined by ICPMS for petrogenetic implications. The lower NB/La ratio (<0.85), negative Nb and Ti anomalies, flat pattern of HFS-elements (Zr, Y) in the NMORB normalized spider diagram, enrichment of LIL-elements (Rb, Ba, Th, Sr) and depletion in Nb (<0.8 ppm) suggest addition of subduction component to the depleted mantle source for gabbroic and basaltic magmas. Tectonic discrimination diagrams i.e. Th/Y-Ta/Y diagram, Ti/Yb-Nb/Yb diagram, Ti/100-Zr-3*Y and Ti/100-Zr-Sr/2 diagrams show transitional character of gabbroic and basaltic rocks between Island Arc Tholeiite (IAT) and depleted mantle Island Arc basalt (NMORB) which is possible in low-pressure extensional environment directly above a subduction or a supra subduction zone. The ophiolite package structurally lying above the syn orogenic and forearc basin (trench-accretionary system) imply that emplacement initiation predates thrusting of the Late Cretaceous accretionary deposits on Indian Plate in Paleocene. These data show that the India-Afghan suturing completed in two tectonic events; i: Late Cretaceous ophiolite obduction and ii: Paleocene final closure (collision). The dataset further indicates that the mixed ophiolite and accretionary system originated in a subduction-accretion setting during two stage collision of the Indian-Afghan plates.

Page(s): 1-1

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Published: Journal: Seventh International Conference on Earth Sciences Pakistan (ESP-2024), June 2-4, 2024 (Abstract Book), Volume: 0, Issue: 0, Year: 2024

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