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GEOREF RECORD

Significance of botryoidal aragonite in early diagenetic history of phylloid algal mounds in Bug and Papoose Canyon fields, southeastern Utah and southwestern Colorado

Michael H. Roylance
Significance of botryoidal aragonite in early diagenetic history of phylloid algal mounds in Bug and Papoose Canyon fields, southeastern Utah and southwestern Colorado (in AAPG annual convention with divisions; SEPM/EMD/DPA)
AAPG Bulletin (April 1984) 68 (4): 523

Abstract

Abundant altered botryoidal aragonite cement is recognized both in core slabs and thin sections from phylloid algal-mound facies in the Desert Creek interval of the Paradox Formation in the Papoose Canyon-Bug field area. This subsequently dolomitized cement occurs as individual to coalescing botryoids, which appear in cross section as rounded feather-edge fans composed of radiating crystals. Botryoids locally comprise up to 90% of any given section of core. The botryoids are similar in appearance to Holocene botryoidal aragonite cement. However, it is deduced that, unlike modern counterparts, these botryoids grew both on the sea floor as well as within open cavities within the mound framework. The diagenetic history of the mounds in the Papoose Canyon-Bug field area was initiated with precipitation of botryoidal aragonite cement penecontemporaneously with deposition of phylloid algal plates, creating rigid anastomosing frameworks containing abundant primary porosity. When compacted, these mounds were brecciated, thus opening up more porosity. Some of the porosity was subsequently infilled by internal sediment and calcite and gypsum cements. Finally, these mounds were extensively dolomitized, and some secondary porosity was created by leaching. The fundamental significance of botryoidal aragonite at Papoose Canyon and Bug fields is that it helped to create and preserve very porous and permeable phylloid algal mounds by contributing to the formation of a rigid framework containing primary porosity, and by cementing the mounds early so that they became brecciated upon compaction. The preserved pores were ultimately filled with oil.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 68
Serial Issue: 4
Title: Significance of botryoidal aragonite in early diagenetic history of phylloid algal mounds in Bug and Papoose Canyon fields, southeastern Utah and southwestern Colorado
Title: AAPG annual convention with divisions; SEPM/EMD/DPA
Affiliation: Marathon Oil Co., Casper, WY, United States
Pages: 523
Published: 198404
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
Meeting name: AAPG annual convention with divisions; SEPM/EMD/DPA
Meeting location: San Antonio, TX, USA, United States
Meeting date: 19840520May 20-23, 1984
Summary: Y
Accession Number: 1985-076764
Categories: Economic geology, geology of energy sourcesSedimentary petrology
Document Type: Serial Conference document
Bibliographic Level: Analytic
N37°00'00" - N41°00'00", W109°00'00" - W102°00'00"
N37°00'00" - N42°00'00", W114°04'60" - W109°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 1985
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