PRINSIP GEOLOGI SEBAGAI KERANGKA PEMIKIRAN MANAJEMEN STRATEGI

Convention Bandung 2004 (CB2004)
The 33rd Annual Convention & Exhibition 2004

Indonesian Association of Geologist
Horizon Hotel, 29-30 Nov, 1 Dec 2004, Bandung

PRINSIP GEOLOGI SEBAGAI KERANGKA
PEMIKIRAN MANAJEMEN STRATEGI

Djoko Sunarjanto dan M.Husen

PPPTMGB ”LEMIGAS”
djoko@lemigas.esdm.go.id; husenm@lemigas.esdm.go.id

Abstract

Many geological aspects can be used as idea to solve the problems. Using the basic
principle of geology is able support the development of strategic management which
need an adjustment and new cases in order to achieve required goal. Priciples of
stratigraphy has relevance with body or structure of organizations which able to
handle situation and conditions, objectives and multi goal. As an analogy,
stratigraphy of SouthEast Wyoming can accommodate restructurization
organizations as a agency of research and development or agency of education and
training is multi functions. So approach of an analytical processes value change has
relevance with rock sedimentary pattern.

For discussion, the study of geological principle as strategic management
framework idea related to the activity and trends to fluctuate can be analogue with
natural cycle. The specific case with strategic characteristics that need alternative
solving was selected such as financial share balancing to mineral and oil and gas
solution can be discovered using geological approach as present technical
parameters and also can be applied to new scenario in order to optimize the
implementation of policy and management between central and region government.

Abstrak

Banyak aspek geologi dapat dijadikan sebagai ide yang digunakan untuk membantu
pemecahan masalah. Menggunakan prinsip dasar geologi mampu mendukung
pengembangan manajemen strategi yang memerlukan penyempurnaan dan hal-hal
baru guna mencapai tujuan (goal) yang diinginkan. Prinsip dalam stratigrafi terdapat
relevansi yang berkaitan dengan bentuk susunan atau struktur organisasi yang
mampu menampung situasi kondisi, kepentingan dan banyak tujuan. Suatu analogi,
stratigrafi South East Wyoming mampu mengakomodasi restrukturisasi organisasi
Badan/Pusat Penelitian dan Pengembangan (Research & Development) ataupun
Pendidikan dan Latihan (Education and Training) yang kaya fungsi. Demikian juga
suatu pendekatan analisis proses perubahan nilai strategis terdapat relevansinya
dengan pola sedimentasi batuan.

Diskusi tentang prinsip geologi sebagai kerangka pemikiran dalam manajemen
strategi terkait dengan aktivitas yang cenderung selalu berubah mampu
dianalogikan dengan siklus di alam. Hal khusus bersifat strategis yang memerlukan
alternatif keputusan seperti opsi perimbangan keuangan hasil bagi pendapatan dari
mineral dan migas, dapat dikaji kembali dengan pendekatan geologi sebagai
parameter teknis yang baru sekaligus diaplikasikan untuk lebih mengoptimalkan
pelaksanaan kebijakan dan manajemen bagi hasil antara pemerintah pusat dan
daerah.

Key words : Geology and Strategic Management

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STRUKTUR PADA BATUAN SERPENTINIT DI SEPANJANG SEMPADAN JALUR TENGAH DAN JALUR BARAT SEMENANJUNG MALAYSIA

Convention Bandung 2004 (CB2004)
The 33rd Annual Convention & Exhibition 2004

Indonesian Association of Geologist
Horizon Hotel, 29-30 Nov, 1 Oct 2004, Bandung

STRUKTUR PADA BATUAN SERPENTINIT DI
SEPANJANG SEMPADAN JALUR TENGAH DAN
JALUR BARAT SEMENANJUNG MALAYSIA

Jatmika Setiawan1), Ibrahim Adullah2), Zaiton Harun2)
jatmikasetiawan855@hotmail.com, iba@pkrisc.cc.ukm.my, zaiton@pkrisc.cc.ukm.my

1) Jurusan Teknik Geologi, Fakultas Teknologi Mineral, UPN “Veteran Yogyakarta
2) Program Geologi, Fakulti Sains dan Teknologi, Universitas Kebangsaan Malaysia

Abstrak

Di sepanjang sempadan (batas) Jalur Tengah dan Jalur Barat Semenanjung
Malaysia, yang dikenali sebagai Garisan Bentong-Raub atau Sutura Bentong,
tersingkap beberapa jasad serpentinit yang berjajaran pada arah antara N340oEN350oE.
Singkapan-singkapan tersebut dipercayai mewakili batuan ultramafik yang
dahulunya merejah batuan Devon Bawah dan kemudiannya telah berubah menjadi
serpentinit. Batuan serpentinit tersebut tersingkap di Bukit Rokan Barat, Kampung
Selaru, Petasih (Negeri Sembilan); Cheruh-Bentong (Negeri Pahang) dan Kelantan
Barat (Negeri Kelantan). Seterusnya kajian struktur di batuan serpentinit dapat
digunakan untuk menjelaskan sejarah canggaan (deformasi) yang telah berlaku di
sepanjang sempadan Jalur Barat dan Jalur Tengah Semenanjung Malaysia.

Observasi lapangan pada singkapan-singkapan serpentinit dijumpai struktur foliasi,
telerang, jalur ricih dan sesar. Foliasi umumnya berjurus utara-baratlaut (UBL),
kecuali di Petasih dan Cheruh yang berjurus barat-baratlaut (BBL). Deformasi
pertama berarah arah NNW hingga NNE, menghasilkan sesar songsang (naik) geser
kanan (SSGK) dengan jurus sesar SE-NW dan kemiringan antara 70o-80o.
Deformasi kedua dengan tegasan berarah NE-SW, menghasilkan sesar SSGK
berjurus antara N340oE-N350oE atau N160oE-N170oE dan kemiringan antara 70o85o.
Deformasi ketiga dengan tegasan kompresi berarah NEE-SWW, menghasilkan
sesar mendatar kanan normal (SMKN) dengan jurus dan kemiringan N20oE/70o atau
N130oE/70o. Deformasi terakhir dengan tegasan timurlaut-baratdaya (TL-BD),
menghsilkan sesar songsang geser kiri (SSGK) dengan jurus dan kemiringan
N270oE/85o.Hasil kajian petrografi dari semua sayatan nipis mendapati bahawa
batuan asal ultramafik telah terubah menjadi mineral serpentin. Kecuali di daerah
Cheruh-Bentong masih terlihat batuan asalan serpentinit adalah batuan igneus
Peridotit

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ORGANIC PETROLOGY OF SELECTED TERTIARY KALIMANTAN COALS

Convention Bandung 2004 (CB2004)
The 33Convention Bandung 2004 (CB2004)
The 33AnnualConvention & Exhibition 2004

Indonesian Association ofGeologist
Horizon Hotel, 29-30 Nov, 1 Oct 2004, Bandung

ORGANIC PETROLOGY OF SELECTED TERTIARY
KALIMANTAN COALS

By :

Binarko Santoso and Bukin Daulay

R and D Centre for Mineral and Coal TechnologyJalan Jenderal Sudirman 623 Bandung 40211Ph. 022-6030483, fax. 022-6003373, email binarkos@tekmira.esdm.go.id

ABSTRACT

Study on organic petrology was carried out on both East and South Kalimantan Palaeogene andNeogene coals. West and Central Kalimantan coals are ignored in the study, because their
geological conditions are not favourable and the seams are usually thin and generally rich inargillaceous or arenaceous mineral matter.

Similarities and differences in type and rank characteristics in the coals reflect their geologicalsetting. Rank and type variation of the coals were assessed by petrographic examination of 40samples. The coals are dominated by vitrinite, common exinite and rare inertinite and mineralmatter. The type differences reflect climatic influence and differences in peat conditions.

Rank of the coals depends largely on the geological age and the level of temperature under
confining pressure (burial depth). Increased depth of burial and increased temperature andpressure over a period of time, consequently result in higher rank. Reflectance measurements on
the coals indicate that there is a substantial difference in rank between Palaeogene and Neogenecoals. The Palaeogene coals are sub-bituminous to high volatile bituminous rank (Rvmax of 0.53-
0.67%), whereas Neogene coals are brown to sub-bituminous rank (Rvmax of 0.30-0.57%),
according to the Australian classification.

SARI

Studi petrologi organik telah dilakukan terhadap batubara Paleogen dan Neogen diKalimantanTimur dan Selatan. Batubara Kalimantan Barat dan Tengah tidak termasuk dalam studi ini, sebabtatanan geologisnya kurang menarik dan lapisan-lapisan batubaranya umumnya tipis dan banyak
mengandung mineral berpartikel lempung dan pasir.

Kesamaan dan perbedaan karakteristik jenis dan peringkat batubara di daerah penelitian
mencerminkan tatanan geologisnya. Variasi jenis dan peringkat batubara tersebut diteliti di bawahpengujian petrografis terhadap 40 buah contoh. Batubara Kalimantan didominasi olehvitrinit,
eksinit dan sedikit inertinit dan mineral. Perbedaan jenis batubara tersebut mencerminkanpengaruh cuaca dan perbedaan lingkungan pembentukan gambutnya.

Peringkat batubara Kalimantan terkontrol oleh umur geologis, suhu dan ketebalan lapisanpenutupnya. Semakin tebal lapisan penutup, suhu dan tekanan pada suatu periode waktu tertentu,
menghasilkan peringkat yang lebih tinggi. Pengukuran reflektansi vitrinitnya menunjukkanperbedaan penting peringkat antara batubara Paleogen dan Neogen. Batubara Paleogen tersebutberperingkat subbituminus-bituminus zat terbang tinggi (Rvmax 0.53-0.67%), sedangkan batubaraNeogennya adalahbatubara coklat-subbituminus (Rvmax 0.30-0.57%), berdasarkan klasifikasiAustralia.

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MINERAL RESOURCE ASSESSMENT OF PORPHYRY COPPER DEPOSITS IN INDONESIA USING THE USGS 3-PART ASSESSMENT METHOD

Convention Bandung 2004 (CB2004)
The 33rd Annual Convention & Exhibition 2004

Indonesian Association of Geologist
Horizon Hotel, 29-30 Nov, 1 Dec 2004, Bandung

MINERAL RESOURCE ASSESSMENT OF
PORPHYRY COPPER DEPOSITS IN INDONESIA
USING THE USGS 3-PART ASSESSMENT
METHOD

Bambang Tjahjono Setiabudi

Directorate of Mineral Resources Inventory
E-mail: BTSetiabudi@hotmail.com

ABSTRACT

Mineral Resource Assessment is a field of research and application of
quantitative appraisal methods to evaluate potential mineral resources.
Principally it describes mineral deposits, measures their grade and tonnage,
estimate the occurrence of the undiscovered deposits and estimates mineral
resources in the permissive tracts. The main objectives are to outline the
principal areas in Indonesia that have potential for selected undiscovered
mineral resources and to estimate the probable amounts of those mineral
resources to a depth of 1 km below the earth's surface. The assessment is
carried out using the USGS 3-Part Quantitative Mineral Resource Assessment
Method. The 3-part method consists of firstly, delineating tracts for commodities
and porphyry Cu deposit types based on the geology of the ore deposits,
secondly, estimating the amount of resources contained in the undiscovered
deposits using appropriate ore characteristics and metal contents based on
grade and tonnage models and thirdly, estimating number of undiscovered
deposits of each type for each delineated area. Overview of porphyry copper
resources in Indonesia as the results of mineral assessment includes
standardized database for known mineral deposits and occurrences, digital
regional-scale maps of tracts permissive for current known deposits as well as
undiscovered mineral resources, and estimates of undiscovered mineral
resources within permissive tracts for copper (copper-gold).

SARI

Penilaian Sumber Daya Mineral adalah suatu bidang penelitian dan aplikasi
metode kuantitatif untuk mengevaluasi potensi sumber daya mineral. Metoda ini
menjelaskan endapan mineral, menentukan kadar dan tonase, memperkirakan
keterdapatan endapan yang belum ditemukan dan memperkirakan jumlah
sumber daya mineral di daerah tersebut. Tujuan utamanya adalah untuk
menentukan daerah-daerah utama di Indonesia yang memiliki potensi sumber
daya mineral tertentu yang belum ditemukan dan untuk memperkirakan jumlah
sumber daya mineral tersebut sampai batas kedalaman 1 km dibawah
permukaan bumi. Penilaian ini menggunakan USGS 3-Part Quantitative Mineral
Resource Assessment Method. Metoda ini terdiri atas 3 bagian, yaitu (1)
menentukan tract untuk komoditas dan endapan tembaga porfiri berdasarkan
geologi endapan bijih, (2) memperkirakan jumlah sumber daya yang terkandung
dalam jenis endapan yang belum ditemukan dengan menggunakan karakteristik
endapan dan kandungan logam berdasarkan model kadar dan tonase, dan (3)
memperkirakan jumlah endapan yang belum ditemukan untuk setiap jenis di
daerah yang telah ditentukan. Pengkajian sumber daya tembaga porfiri di
Indonesia sebagai hasil penilaian sumber daya mineral ini meliputi database
standard untuk endapan mineral yang prospek maupun yang berupa indikasi,
peta digital regional dan tabel data daerah (tract) untuk endapan yang prospek
maupun yang belum ditemukan, estimasi sumber daya mineral yang belum
ditemukan dalam suatu tract untuk endapan tembaga (tembaga-emas).

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REMBANG-MADURA-KANGEAN-SAKALA (RMKS) FAULT ZONE, EAST JAVA BASIN : THE ORIGIN AND NATURE OF A GEOLOGIC BORDER

Awang H. Satyana 1), Edward Erwanto 1), C. Prasetyadi 2)

1) Exploration Division, Badan Pelaksana Migas, Jakarta

2) Geology Department, University of Pembangunan Nasional Veteran, Yogyakarta

 

Abstract

A major wrench zone, left-lateral slip in nature, strongly deformed a series of Late Oligocene to Pleistocene rocks in the northern coastal line of East Java and its eastern islands and offshore areas. The fault zone trends west – east forming a deformed zone of 15 to 40 km wide and 675 km long from Rembang area in the west through Madura Island and Kangean Islands to Sakala offshore area in the east. The deformed zone is called the Rembang-Madura-Kangean-Sakala (RMKS) Fault Zone.

Based on the regional setting of East- and Southeast Sundaland, it is known that the RMKS Fault Zone occurred at the hinge belt or shelf edge to slope area of a geologic transition from the stable Eastern Sunda Shelf to the north (the Northern Platform) to the deep-water area to the south. There is a contrast of sedimentary facies to the north and south of the RMKS Fault Zone. Tectonically, the stable Eastern Sunda Shelf is considered to overlie the expected micro-continent called the Paternoster-Kangean. Therefore, the RMKS Fault Zone is located at the southern margin of the micro-continent. Basement lithology and configuration to the north and south of the RMKS Fault Zone are different.

A number of mechanisms are considered to origin the RMKS Fault Zone. These include : the westward stress driven by the collision of the Buton-Tukang Besi and Banggai-Sula to the east of Sulawesi, westward stress due to the collision of Australia with Timor and anti-clockwise bending of the Banda Arc, and northward stress due to the subduction of the Indian oceanic crust beneath Java. The initiation of the RMKS Fault Zone was in the upper Early Miocene in Sakala area and younger westward until the Middle Miocene in Rembang area.

Along the RMKS Fault Zone, flower structures are definitely identified on seismic sections, showing basement-involved, deeply-rooted vertical master faults with upward diverging splays/strands that have mostly reverse separations. In map view, these splays are mapped as fold and fault belts trending west-east and west northwest-east southeast. Extensional component of the wrench zone subsided the Paleogene rifted blocks such as the Central Deep and formed a number of normal faults. Tectonic inversion related with both pure and simple shear deformations is observed along the fault zone. Shale diapirism commonly occurs to the south of the fault zone and its occurrence is related to wrench tectonism in thick shale sequences deposited rapidly to the south of the RMKS Fault Zone.

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