Paleoenvironmental, paleoecological and thermal metamorphism implications on the organic petrography and organic geochemistry of Tertiary Tanjung Enim coal, South Sumatra Basin, Indonesia
type: CreativeWork
description: Organic petrography and organic geochemistry studies have been conducted on Tertiary age coals from Tanjung Enim, South Sumatra Basin, Indonesia. The coals are of subbituminous rank (vitrinite/huminite reflectance, VRr, = 0.35 - 0.46%). In this area, the coals were also locally intruded by andesitic sills. The thermally metamorphosed coals are of medium-volatile bituminous to meta-anthracite rank (high vitrinite reflectance, VRr up to 5.18%). The studied low rank coals are dominated by huminite. Less abundant are liptinite and inertinite. Minerals are found only in small amounts; mostly as iron sulfide. The high rank coals are dominated by thermally altered vitrinite. Mosaic structures can be recognized as groundmass and crack fillings. The most common minerals found are carbonates, pyrite or marcasite and clay minerals. The latter consist of kaolinite in low rank coal and illite and rectorite in high rank coal. Based on maceral assemblages, the low rank coals can be grouped into five classes: (1) humotelinite-rich group, (2) humodetrinite-rich group, (3) humocollinite-rich group, (4) inertinite-rich group and (5) humodetrinite-liptinite-rich group. The basal section of the studied coal seams is represented by the humodetrinite-liptinite-rich group. The middle section of the seams is characterized by humotelinite-rich and humocollinite-rich groups. The top section of the coal seams is typically represented by the humodetrinite-rich or inertinite-rich group. The sequence of maceral assemblages thus represents the change of topogenous to ombrogenous peat and the development of a raised peat bog. The coalification path of each maceral shows that vitrinite, liptinite and inertinite reflectance converge in a transition zone at VRmax of around 1.5%. Significant decrease of volatile matter occurs in the zone between 0.5 - 2.0% VRmax. A sharp bend occurs at VRmax between 2.0% and 2.5%. Above 2.5%, the volatile matter decreases only very slightly. Between VRr = 0.5% and 2.0%…
abstract: Organic petrography and organic geochemistry studies have been conducted on Tertiary age coals from Tanjung Enim, South Sumatra Basin, Indonesia. The coals are of subbituminous rank (vitrinite/huminite reflectance, VRr, = 0.35 - 0.46%). In this area, the coals were also locally intruded by andesitic sills. The thermally metamorphosed coals are of medium-volatile bituminous to meta-anthracite rank (high vitrinite reflectance, VRr up to 5.18%). The studied low rank coals are dominated by huminite. Less abundant are liptinite and inertinite. Minerals are found only in small amounts; mostly as iron sulfide. The high rank coals are dominated by thermally altered vitrinite. Mosaic structures can be recognized as groundmass and crack fillings. The most common minerals found are carbonates, pyrite or marcasite and clay minerals. The latter consist of kaolinite in low rank coal and illite and rectorite in high rank coal. Based on maceral assemblages, the low rank coals can be grouped into five classes: (1) humotelinite-rich group, (2) humodetrinite-rich group, (3) humocollinite-rich group, (4) inertinite-rich group and (5) humodetrinite-liptinite-rich group. The basal section of the studied coal seams is represented by the humodetrinite-liptinite-rich group. The middle section of the seams is characterized by humotelinite-rich and humocollinite-rich groups. The top section of the coal seams is typically represented by the humodetrinite-rich or inertinite-rich group. The sequence of maceral assemblages thus represents the change of topogenous to ombrogenous peat and the development of a raised peat bog. The coalification path of each maceral shows that vitrinite, liptinite and inertinite reflectance converge in a transition zone at VRmax of around 1.5%. Significant decrease of volatile matter occurs in the zone between 0.5 - 2.0% VRmax. A sharp bend occurs at VRmax between 2.0% and 2.5%. Above 2.5%, the volatile matter decreases only very slightly. Between VRr = 0.5% and 2.0%…
author: Amijaya, Donatus Hendra
language: eng
keywords: info:eu-repo/classification/ddc/550, Geowissenschaften, Kohle, Sumatra, Indonesien, organische Petrographie, organische Geochemie, coal, South Sumatra, Indonesia, organic petrography, organic geochemistry
date published: 2005
date modified: 2026-07-30T19:42:48Z
provider: RWTH Aachen University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Publikationsserver der RWTH Aachen University