Clay mineral diagenesis in Westwater Canyon sandstone member of Morrison Formation, San Juan basin, New Mexico

Conference · Fri Sep 01 00:00:00 EDT 1989 · AAPG Bulletin (American Association of Petroleum Geologists); (USA)

OSTI ID:5499407

Crossey, L J ^[1]

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1. Univ. of New Mexico, Albuquerque (USA)

The Westwater Canyon Sandstone Member and the Brushy Basin and Recapture Shale Members of the Morrison Formation are examined from core located on the southern flank of the San Juan basin, northwestern New Mexico. Clay mineralogy of fine-grained lithologies of the Westwater Canyon Sandstone Member is contrasted with that of coarse-grained lithologies. Two distinct mixed-layer clay populations are present: a high expandable mixed-layer illite/smectite associated with coarse-grained lithologies. Two distinct mixed-layer clay populations are present: a highly expandable mixed-layer illite/smectite associated with coarse-grained units (in addition to chlorite and kaolinite), and an illitic mixed-layer illite/smectite (in some cases ordered and accompanied by traces of chlorite) in the fine-grained units. The expandable component of the mixed-layer clay does not exhibit a trend with depth but is lithology dependent. Coarse-grained samples from the Westwater Canyon Sandstone Member contain numerous mudstone intraclasts. The clay mineralogy of selected clasts has been examined. These lithologic characteristics must be taken into account in interpreting clay mineral diagenesis within the Morrison Formation. Framework grain alternation within the Westwater Canyon Sandstone Member has been linked to lacustrine facies in the overlying Brushy Basin Shale Member. Authigenic clay minerals within the Westwater Canyon Sandstone Member may provide a record of downward-percolating lake fluids. Early diagenetic effects must be recognized in order to interpret the complete diagenetic history of the Westwater Canyon Sandstone Member.

• OSTI ID: 5499407
• Report Number(s): CONF-8910195-; CODEN: AABUD
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (USA), Vol. 73:9; Conference: AAPG Rocky Mountain Section meeting, Albuquerque, NM (USA), 1-4 Oct 1989; ISSN 0149-1423
• Country of Publication: United States
• Language: English

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