Sedimentary fabric analyses of two Miocene coals from NW Taiwan
- National Central Univ., Chungli (Taiwan, Province of China). Inst. of Applied Geology
Coal is very sensitive to the environmental temperature and pressure changes during coalification. Reflectance indicatrix of vitrinite had been proved to be able to indicate those environmental conditions. In addition, characteristics of maceral types such as their composition and arrangements can further provide some insight about the stratigraphic sequence, tectonic stress, metamorphic maturity, and burial history of their sedimentary environment. Two of the major Miocene coal-bearing formations in Taiwan, i.e., the Nanchuang and the Shihti Formations, are well-developed and outcrop in the northwestern part of Taiwan. They had been subjected to several periods of orogenic disturbances so that the geologic structures are complicated with the occurrence of large scale faults and intensive folds. Igneous activities are expected to further increase the rank of coal and resulting the rearrangements the aromatic micelles in coal. Coal and coal-bearing sedimentary rock samples, mostly from Miocene Nanchuang and Shihti Formations,were collected between Taipei and Miaoli, on the northwestern part of the Western Foothill Belt of Taiwan. Sedimentary fabric analyses were then performed by using a Galai Scan-array 2 image analyzing software equipped with a CCD camera, a TV monitor, a 486 PC and a reflecto-refractive polarized microscope. The particle size (maximum feret diameter), aspect ratio (or sphericity), shape factor (or roundness) and special linear orientation of sporinites were studied. Statistically significant results were analyzed and compared among different sampling sites and stratigraphic formations. A synthetic conclusion concerning the burial history during and after Miocene were thus derived.
- OSTI ID:
- 51960
- Report Number(s):
- CONF-940930-; TRN: IM9524%%430
- Resource Relation:
- Conference: 11. annual international Pittsburgh coal conference: coal, energy and the environment, Pittsburgh, PA (United States), 12-16 Sep 1994; Other Information: PBD: 1994; Related Information: Is Part Of Eleventh annual international Pittsburgh coal conference proceedings: Volume 2; Chiang, S.H. [ed.]; PB: 860 p.
- Country of Publication:
- United States
- Language:
- English
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