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Journal : Buletin Sumber Daya Geologi

Hydrothermal Alteration And Vein Types Of The Randu Kuning Porphyry Cu-Au Deposit At Selogiri Area, Wonogiri Sutarto, Sutarto; Idrus, Arifudin; Putranto, Sapto; Harjoko, Agung; Setijadji, Lucas D; Meyer, Franz M; Danny, Rama
Buletin Sumber Daya Geologi Vol 9, No 1 (2014): Buletin Sumber Daya Geologi
Publisher : Buletin Sumber Daya Geologi

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Abstract

Many Tertiary hydrothermal altered dioritic composition intrusive rocks were found at the Randu Kuning  area and its vicinity, Selogiri, including hornblende microdiorite, hornblende-pyroxene diorite and quartz diorite. The hydrothermal fluids which responsible for the alteration and mineralization at the area is associated with the occurence of the horblende microdiorite intrusion.The alteration zone at the Randu Kuning area and its vicinity can be divided into several hydrothermal alteration zones, such as potassic (magnetite-biotite-K feldspar), prophyllitic (chlorite-magnetite-epidote-carbonate), phyllic (quartz-sericite-chlorite) and argillic (clay mineral-sericite). The alteration pattern in the Randu Kuning porphyry Cu-Au deposit is tipically a diorite  model characterising by the domination of  potassic alteration and prophyllitic zone. Phyllic and argillic alteration types are  restrictive found within the fault zones.A lot of porphyry vein types were found and observed at the Randu Kuning area, and classified into at least seven  vein types.  The paragenetic sequence of those veins from the earliest to the latest respectively are 1). Magnetite-chalcopyrite±quartz-biotite veinlets, 2). Quartz±magnetite (A type) veins, 3). Banded/Laminated quartz-magnetite (M type) veins, 4). Quartz±K feldspar (B type)veins, 5). Quartz  with thin centre line sulphide (AB type) veins, 6). Pyrite±chalcopyrite (C type) veinlets, and 7). Pyrite-quartz+chalcopyrire+carbonate (Dtype) veins. Gold and copper mineralisation  of the Randu Kuning Porphyry Cu-Au deposit, mostly related to the presence of quartz veins/veinlets containing sulfide i.e. Quartz  with thin centre line sulphide veins, Pyrite±chalcopyrite veinlets, and Pyrite-quartz+chalcopyrire+ carbonate veins.
HYDROTHERMAL ALTERATION AND VEIN TYPES OF THE RANDU KUNING PORPHYRY CU-AU DEPOSIT AT SELOGIRI AREA, WONOGIRI Sutarto, Sutarto; Idrus, Arifudin; Putranto, Sapto; Harjoko, Agung; Setijadji, Lucas D; Meyer, Franz M; Danny, Rama
Buletin Sumber Daya Geologi Vol. 9 No. 1 (2014): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (8991.048 KB)

Abstract

Many Tertiary hydrothermal altered dioritic composition intrusive rocks were found at the Randu Kuning  area and its vicinity, Selogiri, including hornblende microdiorite, hornblende-pyroxene diorite and quartz diorite. The hydrothermal fluids which responsible for the alteration and mineralization at the area is associated with the occurence of the horblende microdiorite intrusion.The alteration zone at the Randu Kuning area and its vicinity can be divided into several hydrothermal alteration zones, such as potassic (magnetite-biotite-K feldspar), prophyllitic (chlorite-magnetite-epidote-carbonate), phyllic (quartz-sericite-chlorite) and argillic (clay mineral-sericite). The alteration pattern in the Randu Kuning porphyry Cu-Au deposit is tipically a diorite  model characterising by the domination of  potassic alteration and prophyllitic zone. Phyllic and argillic alteration types are  restrictive found within the fault zones.A lot of porphyry vein types were found and observed at the Randu Kuning area, and classified into at least seven  vein types.  The paragenetic sequence of those veins from the earliest to the latest respectively are 1). Magnetite-chalcopyrite±quartz-biotite veinlets, 2). Quartz±magnetite (A type) veins, 3). Banded/Laminated quartz-magnetite (M type) veins, 4). Quartz±K feldspar (B type)veins, 5). Quartz  with thin centre line sulphide (AB type) veins, 6). Pyrite±chalcopyrite (C type) veinlets, and 7). Pyrite-quartz+chalcopyrire+carbonate (Dtype) veins. Gold and copper mineralisation  of the Randu Kuning Porphyry Cu-Au deposit, mostly related to the presence of quartz veins/veinlets containing sulfide i.e. Quartz  with thin centre line sulphide veins, Pyrite±chalcopyrite veinlets, and Pyrite-quartz+chalcopyrire+ carbonate veins.
Co-Authors A. Harijoko A. Imai A. M. Imran Abadi, Mersi Abdul, Abdul Agung Harijoko Ahmad Ahmad Amijaya, Donatus Hendra Anggara, Ferian Anjarwati, Retno Araki, Naoto Asrafil Asrafil, Asrafil Atmoko, Didik Dwi Danny, Rama Danny, Rama Djoko Wintolo, Djoko E. M. Ati Edy Nursanto Ernowo Ernowo Ernowo Harjanto, Ernowo Esti Handayani F. M. Meyer F. Thamba Fadlin Fadlin Fadlin Idrus Faesal, Andi Franklin Franklin Franz Michael Meyer, Franz Michael Hakim, Fahmi Harjoko, Agung Harjoko, Agung Hasria Hasria, Hasria Hendra Amijaya Hill. Gendoet Hartono Himawan Tri Bayu Murti Petrus, Himawan Tri Bayu Murti I Wayan Warmada, I Wayan I. Nur I. W. Warmada Imai, Akira Irawan, I Gede Budi Irawan Budi Irwan Endrayanto, Irwan Irzal Nur, Irzal Isyqi, Isyqi Iwan Setiawan Johan Arif, Johan Kaharuddin Kaharuddin Kant, Win Khant, Win Koichiro Watanabe, Koichiro Kolb, Jochen L. D. Setijadji Lia Novelia Agung, Lia Novelia Lucas Donny Setijadji, Lucas Donny Mansur, Suaib Maula, Syafruddin Meyer, Franz M Meyer, Franz M Mochammad Aziz, Mochammad Moetamar Moetamar Mohamad Anis, Mohamad Myaing, Yu Yu Myaing, Yu Yu Nurkhamim, Nurkhamim Okki Verdiansyah Petrus, HTBM Pramumijoyo, Pranayoga Putranto, Sapto Putranto, Sapto Putranto, Sapto Rahmayuddin, Rahmayuddin Rika Ernawati S. Pramumijoyo Setijadji, Lucas D Setijadji, Lucas D Sindern, Sven Subagyo Pramumijoyo, Subagyo Subagyo Subagyo Sufriadin Sufriadin Sukamandaru Prihatmoko, Sukamandaru Sukmandaru Prihatmoko Sutarto Sutarto Tamba, Fenny Thwee Aye, May Titisari, Anastasia Dewi Titisari, Anastasia Dewi Tun, Myo Min Ubaidillah, Aji Syailendra Wahyu Widodo Yonezu, Kotaro