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Title Diagenesis and source of coloration in Andesite-derived volcanicliastic rocks of Datil Group (Late Eocene-Early Oligocene), west-central New Mexico
Creator/Author Cather, S.M.
Publication Date1986 Aug 01
OSTI IdentifierOSTI ID: 6962789
Report Number(s)CONF-8609129-
Other Number(s)CODEN: AAPGB
Resource TypeConference
Specific TypeJournal Article
Resource RelationAm. Assoc. Pet. Geol., Bull. ; Vol/Issue: 70:8; AAPG Rocky Mountain Section meeting; 7 Sep 1986; Casper, WY, USA
Research OrgNew Mexico Bureau of Mines and Mineral Resources, Socorro
Subject020200 -- Petroleum-- Reserves, Geology, & Exploration; NEW MEXICO-- RESERVOIR ROCK;NEW MEXICO-- SANDSTONES;RESERVOIR ROCK-- DIAGENESIS; PERMEABILITY;POROSITY;TERTIARY PERIOD
Related SubjectCENOZOIC ERA;FEDERAL REGION VI;GEOLOGIC AGES;NORTH AMERICA;ROCKS;SEDIMENTARY ROCKS;USA
Description/Abstract The Datil Group (32-39 Ma) is the basal unit of the Datil-Mogollon volcanic field of west-central New Mexico.^Andesitic volcaniclastic deposits of the Datil Group exhibit a diverse assemblage of diagenetic minerals.^Early-formed clay minerals (smectite and corrensite) are ubiquitous and occur as grain coatings and as a diagenetic component of matrix in sandstones.^Silica minerals, opal-CT and tiny (5 to 20..mu..m) euhedral quartz crystals, formed next.^Late-stage pore-filling cements include calcite, chlorite, and heulandite-group zeolites.^Propylitization of Datil volcaniclastic rocks near intrusive centers produced pore-filling and replacement products of calcite, epidote, chlorite, and sericite.^Coloration of unaltered Datil Group rocks is gray (average N7); such coloration is preserved in several parts of the outcrop belt.^Buff colors (average 7.5 YR 7/2) result from diffuse limonitic staining produced during recent outcrop weathering.^Pigment in volcaniclastic red beds (average 7.5 R 6/2) is derived from intrastratal dissolution of unstable mafic minerals, precipitation of hydrous iron oxides, and subsequent dehydration of these oxides to produce hematite.^Propylitization of a neutral-colored protolith produces green beds (average 10 GY 5/1).^Purple coloration (average 2.5 RP 5/2) in large areas surrounding mining districts in the Magdalena Mountains and Black Range results from incomplete propylitization of red beds.^Gray and buff in red-bed sequences owe their color to selective, permeability-controlled dereddening.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 1034
System Entry Date2001 May 13

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