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Title: Textures of chert and novaculite: an exploration guide

Abstract

Textures of chert and novaculite observable in scanning electron micrographs (SEMs) are useful as a practical, geologic thermometer for estimating the maximum temperature of those rocks since deposition. Such information may be further applied during exploration for hydrocarbons (maturation or degradation), and for metallic and nonmetallic minerals, in those and associated rocks. Scanning electron micrographs taken of cherts and novaculites that crop out in the Ouachita Mountain foldbelt of Arkansas and Oklahoma, and in areas adjacent to exposed and buried intrusives, show a sequential range in textures from cryptocrystalline, anhedral quartz in the nonmetamorphosed chert and novaculite to coarse euhedral, polygonal, triple-point quartz 60 ..mu..m in diameter. Measurements were made of grain sizes of the quartz along transects across the SEMs of chert and novaculite from the Ouachita foldbelt. From them an isopleth was made showing mean grain sizes of the polygonal triple-point texture developed. Cherts and novaculites adjacent to Magnet cove, a Cretaceous age pluton in the eastern Ouachita Mountains of Arkansas, illustrate a superposed overprinting of polygonal triple-point texture. The triple-point texture and coarseness of chert and novaculite are related to the degree of thermal maturation resulting from various heating events. Very small quantities of chert and novaculite,more » by using SEM techniques, can serve as a guide to areas that have undergone elevated rock temperatures resulting from deep burial, mechanical stresses, intrusions, exhalations, and other thermal events.« less

Authors:
; ;
Publication Date:
Research Org.:
Univ. of Missouri, Columbia
OSTI Identifier:
6555419
Report Number(s):
CONF-8310301-
Journal ID: CODEN: AAPGB
Resource Type:
Conference
Journal Name:
Am. Assoc. Pet. Geol., Bull.; (United States)
Additional Journal Information:
Journal Volume: 67:9; Conference: American Association of Petroleum Geologists eastern section meeting, Carbondale, IL, USA, 3 Oct 1983
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; 58 GEOSCIENCES; CHERT; GEOTHERMOMETRY; TEXTURE; CRYSTAL STRUCTURE; DIAGENESIS; EXPLORATION; GEOLOGIC STRUCTURES; INTRUSION; METAMORPHISM; PLUTONIC ROCKS; SCANNING ELECTRON MICROSCOPY; ELECTRON MICROSCOPY; IGNEOUS ROCKS; MICROSCOPY; ROCKS; SEDIMENTARY ROCKS; 020200* - Petroleum- Reserves, Geology, & Exploration; 030200 - Natural Gas- Reserves, Geology, & Exploration; 580300 - Mineralogy, Petrology, & Rock Mechanics- (-1989)

Citation Formats

Keller, W D, Stone, C G, and Hoersch, A L. Textures of chert and novaculite: an exploration guide. United States: N. p., 1983. Web.
Keller, W D, Stone, C G, & Hoersch, A L. Textures of chert and novaculite: an exploration guide. United States.
Keller, W D, Stone, C G, and Hoersch, A L. Thu . "Textures of chert and novaculite: an exploration guide". United States.
@article{osti_6555419,
title = {Textures of chert and novaculite: an exploration guide},
author = {Keller, W D and Stone, C G and Hoersch, A L},
abstractNote = {Textures of chert and novaculite observable in scanning electron micrographs (SEMs) are useful as a practical, geologic thermometer for estimating the maximum temperature of those rocks since deposition. Such information may be further applied during exploration for hydrocarbons (maturation or degradation), and for metallic and nonmetallic minerals, in those and associated rocks. Scanning electron micrographs taken of cherts and novaculites that crop out in the Ouachita Mountain foldbelt of Arkansas and Oklahoma, and in areas adjacent to exposed and buried intrusives, show a sequential range in textures from cryptocrystalline, anhedral quartz in the nonmetamorphosed chert and novaculite to coarse euhedral, polygonal, triple-point quartz 60 ..mu..m in diameter. Measurements were made of grain sizes of the quartz along transects across the SEMs of chert and novaculite from the Ouachita foldbelt. From them an isopleth was made showing mean grain sizes of the polygonal triple-point texture developed. Cherts and novaculites adjacent to Magnet cove, a Cretaceous age pluton in the eastern Ouachita Mountains of Arkansas, illustrate a superposed overprinting of polygonal triple-point texture. The triple-point texture and coarseness of chert and novaculite are related to the degree of thermal maturation resulting from various heating events. Very small quantities of chert and novaculite, by using SEM techniques, can serve as a guide to areas that have undergone elevated rock temperatures resulting from deep burial, mechanical stresses, intrusions, exhalations, and other thermal events.},
doi = {},
journal = {Am. Assoc. Pet. Geol., Bull.; (United States)},
number = ,
volume = 67:9,
place = {United States},
year = {1983},
month = {9}
}

Conference:
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