Tolukuma and the Papuan Mobile Fold Belt, page-2

For more about the "Papuan Fold Belt", please see the following link from the recent presentation titled "BIBLIOGRAPHY OF THE GEOLOGY OF INDONESIA AND SURROUNDING AREAS - Edition 7.0, July 2018 - VIII. NEW GUINEA (incl. PNG) from J.T. VAN GORSEL

http://www.vangorselslist.com/pdf/BIG_VIII_New_Guinea_7.pdf

On page 7 of this presentation you will find "Figure VIII.1.8. Principal copper-gold deposits of New Guinea (Garwin et al. 2005). Major porphyry coppergold systems are tied to intersections of the magmatic belt and steep transverse faults". On this map you will again see the northeast-southwest trending "transverse" structure (the red line) that runs right through Tolukuma.

For those of you with limited time, just type "Papuan Fold Belt" into the search function and you will find 62 mentions about the "Papuan Fold Belt".

One such mention is the following:

Garwin, S. (2015)- The tectonics, geology and gold-copper metallogeny of New Guinea. In: Proc. PACRIM 2015 Congress, Hongkong, Australasian Inst. of Mining and Metallurgy (AusIMM), Melbourne, Publ. Ser. 2/2015, p. 151-164. (Since Eocene, New Guinea tectonics driven largely by SW-directed collision of accreted arc terranes with N margin of Australian Craton, and subsequent W-directed transport of these exotic terranes by left-lateral strikeslip fault systems. Two major magmatic belts, both with world-class Cu-Au mineralisation: (1) M-L Miocene Maramuni arc (Frieda River, Nena, Wafi-Golpu, etc. deposits), tied to subduction of Solomon Sea plate beneath NE New Guinea; (2) Medial New Guinea magmatic belt (Grasberg, Ok Tedi, Porgera porphyry and epithermal deposits) localised by dilational zones formed at intersections of NE-trending reactivated basement faults and N-dipping reverse faults related to S-ward progression of Papuan fold belt in Late Miocene- Pleistocene. These deposits probably formed during short mantle-derived magmatic episodes in zones of regional isostatic uplift, attributed to delamination of lithospheric mantle beneath New Guinea).

Cheers.