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Evidence of Elliptical Intrusions and Sr, Hf, Pb, O Isotopes of the Khanbogd Alkali Granite Pluton: Constraction of Under-plating Magma Associated with the Duplex Thrust
Version 1
: Received: 16 January 2024 / Approved: 16 January 2024 / Online: 16 January 2024 (12:29:14 CET)
How to cite:
BATULZII, D.; GREGORY, H.; AMARAMGALAN, S. Evidence of Elliptical Intrusions and Sr, Hf, Pb, O Isotopes of the Khanbogd Alkali Granite Pluton: Constraction of Under-plating Magma Associated with the Duplex Thrust. Preprints2024, 2024011242. https://doi.org/10.20944/preprints202401.1242.v1
BATULZII, D.; GREGORY, H.; AMARAMGALAN, S. Evidence of Elliptical Intrusions and Sr, Hf, Pb, O Isotopes of the Khanbogd Alkali Granite Pluton: Constraction of Under-plating Magma Associated with the Duplex Thrust. Preprints 2024, 2024011242. https://doi.org/10.20944/preprints202401.1242.v1
BATULZII, D.; GREGORY, H.; AMARAMGALAN, S. Evidence of Elliptical Intrusions and Sr, Hf, Pb, O Isotopes of the Khanbogd Alkali Granite Pluton: Constraction of Under-plating Magma Associated with the Duplex Thrust. Preprints2024, 2024011242. https://doi.org/10.20944/preprints202401.1242.v1
APA Style
BATULZII, D., GREGORY, H., & AMARAMGALAN, S. (2024). Evidence of Elliptical Intrusions and Sr, Hf, Pb, O Isotopes of the Khanbogd Alkali Granite Pluton: Constraction of Under-plating Magma Associated with the Duplex Thrust. Preprints. https://doi.org/10.20944/preprints202401.1242.v1
Chicago/Turabian Style
BATULZII, D., HOLK GREGORY and SERJLKHUMBE AMARAMGALAN. 2024 "Evidence of Elliptical Intrusions and Sr, Hf, Pb, O Isotopes of the Khanbogd Alkali Granite Pluton: Constraction of Under-plating Magma Associated with the Duplex Thrust" Preprints. https://doi.org/10.20944/preprints202401.1242.v1
Abstract
The studied Khanbogd pluton of peralkaline granite is located in southern Mongolia and occupies an area of ~1000 sq. km. Previously, two ring-shaped bodies were constructed in a flattened shape pluton. However, this shape was not used for the genesis of this pluton. A recent study of Landsat image showed a several elliptical intrusions in two bodies. Chemistry interpretation shows that each intrusion differs in ASI, CIPW norms, 87Sr/86Sri and δ18O isotopes. Elliptical intrusions, uplifted country rocks between them, and roof pendants suggest magma penetration along fractured country rocks. Furthermore, two adjacent intrusive bodies and undeformed host rocks at the front part of the pluton are consistent with underplating magmatic factors during duplex-type thrusting. This magma event is also supported by low of Sr, Ba, Eu and high of Th, U, Pb anomalies and a few amount of garnet crystals in the granites, implying vapor absent melt crystallization associated with underplating. Multiple melt sources, as well as from mantle and recycled sea floor rocks, are identified by ratio of 87Sr /86Sri and δ18O values. The low isotope values, the thrust nature and 295–286 Ma ages of the alkali granites, indicate an underplate magma evidenced during Permian rifting.
Environmental and Earth Sciences, Geochemistry and Petrology
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