Depositional environment of the Fort Member of the Jurasic Jaisalmer Formation (western Rajasthan, India), as revealed from lithofacies and grain-size analysis

Authors

  • F. AHMAD Department of Geology, Aligarh Muslim University Aligarh, Uttar Pradesh, 202002, India
  • M. A. QUASIM Department of Geology, Aligarh Muslim University Aligarh, Uttar Pradesh, 202002, India
  • A. A. GHAZNAVI Department of Geology, Aligarh Muslim University Aligarh, Uttar Pradesh, 202002, India
  • Z. KHAN Department of Geology, Aligarh Muslim University Aligarh, Uttar Pradesh, 202002, India
  • A. H. M. AHMAD Department of Geology, Aligarh Muslim University Aligarh, Uttar Pradesh, 202002, India

Keywords:

Lithofacies, Grain-size analysis, Depositional environment, Shallow marine, Fort Member, Jurassic

Abstract

Lithofacies and granulometric analysis were carried out to decipher the depositional environment of the Fort Member of the Jurassic Jaisalmer Formation. Based on field data nine lithofacies have been identified including trough cross-bedded sandstones, planar cross-bedded sandstones, matrix supported conglomerates, thinly bedded siltstone and sandstones, herringbone cross-bedded sandstones, wave rippled sandstones, laminated sandstones, hummocky cross-bedded sandstones, limestones and shales. Granulometric analysis of the sandstones samples has been carried out for their statistical and textural parameters. Bivariant plots of textural parameters such as graphic skewness versus graphic standard deviation and kewness versus standard deviation confirm the high energy (beach) origin of sandstones. These results suggest a wide spectrum of marine environments ranging from inner shelf to upper shoreface for the Fort Member sandstones.

Author Biographies

F. AHMAD, Department of Geology, Aligarh Muslim University Aligarh, Uttar Pradesh, 202002, India

RESEARCH SCHOLAR

 

M. A. QUASIM, Department of Geology, Aligarh Muslim University Aligarh, Uttar Pradesh, 202002, India

RESEARCH ASSISTANT

A. A. GHAZNAVI, Department of Geology, Aligarh Muslim University Aligarh, Uttar Pradesh, 202002, India

RESEARCH SCHOLAR

Z. KHAN, Department of Geology, Aligarh Muslim University Aligarh, Uttar Pradesh, 202002, India

RESEARCH SCHOLAR

A. H. M. AHMAD, Department of Geology, Aligarh Muslim University Aligarh, Uttar Pradesh, 202002, India

PROFESSOR

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Published

2017-09-04

Issue

Vol. 15 No. 3 (2017)

Section

Articles

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