Mud volcanoes, shale diapirs, wrench faults, and melanges in accretionary complexes, eastern Indonesia

Journal Article · Sat Nov 01 00:00:00 EST 1986 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:6988057

Barber, A J; Tjokrosapoetro, S; Charlton, T R

In Timor, eastern Indonesia, where the northern margin of the Australian continent is colliding with the Banda Arc, Australian continental margin sediments are being incorporated into an imbricate wedge, which passes northward into a foreland fold and thrust belt. Field mapping in Timor has shown that scale clays, containing irregularly shaped or phacoidal blocks (up to several meters long) and composed of a wide range of lithologies derived from local stratigraphic units, occur in three environments: along wrench faults, as crosscutting shale diapirs, and associated with mud volcanoes. A model is proposed linking these phenomena. Shales become overpressured as a result of overthrusting; this overpressure is released along vertical wrench faults, which cut through the overthrust units; overpressured shales containing blocks of consolidated units rise along the fault zones as shale diapirs; and escaping water, oil, and gas construct mud volcanoes at the surface. 6 figures, 1 table.

• Research Organization: Univ. of London, England
• OSTI ID: 6988057
• Journal Information: Am. Assoc. Pet. Geol., Bull.; (United States), Vol. 70:11
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
INDONESIA
GEOLOGIC STRUCTURES
TECTONICS
GEOLOGIC FAULTS
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
SHALES
STRATIGRAPHY
ASIA
DEVELOPING COUNTRIES
GEOLOGIC DEPOSITS
GEOLOGIC FRACTURES
GEOLOGY
ISLANDS
MINERAL RESOURCES
RESOURCES
ROCKS
SEDIMENTARY ROCKS
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration