Clay mineralogy of Pliocene-Pleistocene mudstones, eastern Taiwan: Combined effects of burial diagenesis and provenance unroofing

Journal Article · Sat Oct 01 00:00:00 EDT 1988 · Geology; (USA)

DOI:https://doi.org/10.1130/0091-7613(1988)016<0944:CMOPPM>2.3.CO;2· OSTI ID:6982745

Dorsey, R J; Buchovecky, E J; Lundberg, N ^[1]

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1. Princeton Univ., NJ (USA)

Pliocene-Pleistocene sedimentary rocks in the Coastal Range of eastern Taiwan were deposited in a synorogenic collisional basin that developed immediately east of the growing Taiwan fold and thrust belt during active arc-continent collision. Unmetamorphosed mudstones from this stratigraphic sequence, which were buried up to 6 km deep, contain abundant detrital illite and chlorite derived from the adjacent metamorphic orogen. A surprisingly small down-section increase in percent illite layers in mixed-layer illite/smectite provides evidence for a low paleogeothermal gradient (about 14 C/km), possibly combined with kinetic retardation of the illitization reaction resulting from short duration of maximum burial. Illite crystallinity increases from the base to the top of the stratigraphic sequence, opposite to the expected trend for burial metamorphism. This reverse trend parallels lithic-fragment detrital modes of sandstones from the same sequence and records progressive unroofing of the nearby prograde metamorphic terrane during collision-related uplift and deformation.

• OSTI ID: 6982745
• Journal Information: Geology; (USA), Vol. 16:10; ISSN 0091-7613
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
SEDIMENTARY BASINS
MINERALOGY
TAIWAN
CHLORITE MINERALS
CRYSTALLIZATION
DEPOSITION
DIAGENESIS
GEOLOGIC HISTORY
GEOLOGIC MODELS
GEOTHERMAL GRADIENTS
GROUND UPLIFT
ILLITE
METAMORPHISM
MINERALIZATION
ORIGIN
PLATE TECTONICS
PLEISTOCENE EPOCH
PLIOCENE EPOCH
SEDIMENTARY ROCKS
SILTSTONES
SMECTITE
STRATIGRAPHY
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
ASIA
CENOZOIC ERA
CLAYS
GEOLOGIC AGES
GEOLOGIC STRUCTURES
GEOLOGY
ISLANDS
MINERALS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
QUATERNARY PERIOD
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
TECTONICS
TEMPERATURE GRADIENTS
TERTIARY PERIOD
580000* - Geosciences