DETECTION OF PEAT PALEO-ENVIRONMENT BASED ON TPI-GI: EVIDENCE FROM SOUTH BARITO

This slide was presented in the ICES ITB July 2016. The official website of this event is http://portal.fi.itb.ac.id/ices2016/. I also invite you to visit my blogs: dasaptaerwin.wordpress.com and dasaptaerwin.net/wp.

The first author is Akbar Prima Jaya an ITB graduate, now pursuing master program in geology. He is now working as a engineering consultant. He can be contacted at akbarprimajaya[at]gmail[dot]com.

@dasaptaerwin
ORCID: 0000-0002-1526-0863

Transcript

1. 1 DETECTION OF PEAT PALEO-ENVIRONMENT BASED ON TPI-GI: EVIDENCE FROM SOUTH BARITO JAYA. A.P.(1), TABRI, K.N.(1), DWTAMA, P.E.(2), AND IRAWAN, D.E(1) (1) FACULTY OF EARTH SCIENCE AND TECHNOLOGY, INSTITUT TEKNOLOGI BANDUNG (2) CENTER FOR GEOLOGICAL RESOURCES SURVEY OF INDONESIA Rabu, 27 Agustus 2016 akbarprimajaya@gmail.com
2. 2 Research Location Located in Central Kalimantan Province, South Barito District, Gunung Bintang Awai Sub-district UTM Coodinate: 290362.68-9839684.97 mE and 299682.57-9830609.16 mS Based on (UTMWGS84) Lokasi penelitian
3. 3 W E E W S N Research Area
4. 4 Physiography Barito Basin Barito basin is tertiary basin Basin border: North : Adang fault dan Kutai basin; West : Schwaner mountain area, Pembuang basin; East : Meratus complex; South : Java Sea Regional Physiography of Kutai Basin (Modified from Paterson et.al., 1977 in Mora et.al., 2000)
5. 5 Research Objectives To determine the condition of the rock layers Geologic particularly coal barrier; To Understand the Peat Paleoenvironment based on Maceral Analysis
6. 6 Rock Outcrop observation Data Retreival Metodhs of Bore Hole/Core Collection
7. 7 • Classification Table of coal organic maceral by Australian Standards (1986) 15 coal sample convert into polished pellets Using the Microscope Carl Zeiss with the white light reflection and light flourenseen Using immersion oil with 50x magnification Standard temperature (23C-25C) Maceral Analysis
8. 8 Coal Seam(Eastern Area) Tc Tc Sf lp Tc Dn Id cut cut 50µm Coal Fotomicrographs that related to : Tc : (Telovitrnite-Telocolinite) Dn : (Detrovitrinite- Densinite) Sf : (Teloinertinite-semifusinite) Id : (Detroinertinite-inertodetrinite) Cut : (Liptinite(Cutinit) Lp : (Mineral matter- Clay)
9. 9 Coal Seam(Western Area) Fs Ds Lp 50µm Ds Cg Lp Py Mi 50µm Dn Pg Mi 50µm Pg Tc Dn Lp Cut 50µm Tc Tc Coal Fotomicrographs that related to : Tc : (Telovitrnite-Telocolinite) Cut : (Liptinite-Cutinite) Dn : (Detrovitrinite-Densinite) Ds : (Detrovitrinite-Desmocolinite) Cg : ( Gelovitrinite-Corpogelinite) Pg : (Gelovitrinite-Porigelinite) Sc : (Teloinertinite-scelotinite) Fs : (Teloinertinite-Fusinite) Lp : (Mineral matter-Clay) Py : Pyrite 50µm
10. 10 Maceral Compositions
11. 11 MACERAL Average East Average West GROUP ( % ) ( % ) Textinite Texto-ulminite Eu-ulminite Telocolinite Attrinite Densinite Desmocolinite Corpogelinite Porigelinite Eugelinite Sporinite 0.3 0.3 Cutinite 0.7 1.1 Resinite 0.3 0.3 Liptodetrinite 0.1 0.0 Alginite 0.0 0.1 Suberinite 0.0 0.2 Fluorinite 0.0 0.1 Exsudatinite 0.0 0.0 Bituminite 0.0 0.0 Fusinite Semifusinite Sclerotinite Inertodetrinite Micrinite Gelo-inertinite Macrinite 0.1 0.0 MINERAL Iron oxides MATTER Pyrites Clay minerals Others TOTAL 100.0 100.0 2.1 4.7 LIPTINITE INERTINITE Telo-inertinite 1.2 1.5 Detro-inertinite 0.1 0.0 MACERAL SUBGROUP MACERAL VITIRINITE Telovitrinite 59.0 54.5 Detrovitinite 34.2 34.4 Gelovitirinite 2.0 2.8 Maceral Compositions Vitrinite-Telovitrinite Dominant
12. 12 TPI dan GI Coal facies could be anlalyized using TPI parameter (Tissue Preservation Index) and GI paramater (Gelification Index).Diessel (1982) TPI shows a comparison of tissue structure that maintained and tissue structure that decomposed. GI related to continuity of peat humidity ) ( nite Geloinerti inite Detroinert ite Gelovitrin nite Detrovitri nite Teloinerti ite Telovitrin TPI + + + + = inite Detroinert ite Telonertin GI nite geloinerti Vitrinite + = +
13. 13 Daerah SEAM Kode sampel TPI GI BARAT SEAM B1 lb11 1.54 61.80 lb19 1.54 77.42 Bor4 1.55 78.00 SEAM B2 lb15 1.64 28.47 Bor1 1.71 32.43 SEAM B3 LB14 1.35 62.33 Bor2 1.47 44.10 SEAM B4 lb17 1.40 50.33 Bor 3 1.32 55.00 Daerah SEAM Kode sampel TPI GI TIMUR SEAM A1 TBK11 1.73 88.02 LB10 1.72 96.30 SEAM A2 TBK10 1.66 87.47 lb10 1.58 86.82 lb9 1.47 96.40 SEAM A3 lb18 1.83 41.15 Calculation Results
14. 14 GI values> 5 and TPI> 1 of all Seam shows the peat formation condition under wet situation, with percentage of vitrinite > inertinite and Telovitrinite> Detrovitrnite indicate the deposition process in wet forest swamp under telmatic zone • Gambar Plot Nilai GI-TPI satuan batupasir pada diagram fasies (Deisel, 1986) Peat Paleoenvironment Analysis (Eastern Area)
15. 15 Nilai GI>5 dan TPI>1 with percentage of vitrinite > inertinite and Telovitrinite> Detrovitrnite indicate the deposition process in wet forest swamp under telmatic zone GI values in the western area are generally lower than the eastern area indicating relatively dry environment. • Gambar Plot Nilai GI-TPI daerah Barat pada diagram fasies (Deisel, 1986) Peat Paleoenvironment Analysis (Western Area)
16. 16 Main Maceral component constituent of coal in the form of Vitrinite ( average 93.1%) with dominant subgroups Telovitrinite ( average 56.3%) ; From the Diessel Diagram the data fall into telmatic zone with wet forest swamp type, and upper delta plain environment; Western area have an environment that is relatively drier than the Eastern area that showed from lower GI value. Conclusion
17. 17 Thank you