Geochemistry of differentiated lamprophyre dyke, South Delhi fold belt, Pipela area, District Sirohi, Rajasthan

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Authors:Kirmani, I. R.; Fareeduddin
Author Affiliations:Primary:
Geological Survey of India, Western Region, Jaipur, India
Volume Title:Journal of the Geological Society of India
Source:Journal of the Geological Society of India, 56(6), p.615-623. Publisher: Geological Society of India, Bangalore, India. ISSN: 0016-7622
Publication Date:2000
Note:In English. 22 refs.; illus., incl. 1 table, geol. sketch map
Summary:A dyke of lamprophyric composition intrudes the meta-volcanic rocks of Ajabgarh Group of the Delhi Supergroup near Pipela, Sirohi district, Rajasthan. It exhibits well-defined compositional and textural layering in the form of chilled margin, sparsely porphyritic zone, aphyric zone and central porphyritic zone. Geochemical studies of this lamprophyric rock have led to the following interpretations: (i) the lamprophyric melt was derived from a less metasomatised mantle, (ii) crustal contamination took place during ascent and/or emplacement (iii) there was sufficient time for the lamprophyric body to differentiate into well-defined layers, and (iv) there was post-emplacement hydrothermal alteration.
Subsections:Igneous rocks
Subjects:Chemical composition; Delhi Supergroup; Differentiation; Dikes; Geochemistry; Igneous rocks; Intrusions; Lamprophyres; Plutonic rocks; Precambrian; Asia; India; Indian Peninsula; Rajasthan India; Sirohi India; Pipela India
Coordinates:N230000 N301000 E0775000 E0693000
Abstract Numbers:01M/1813
Record ID:2001057941
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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