Match!

Early Cretaceous adakite from the Atlas porphyry Cu-Au deposit in Cebu Island, Central Philippines: Partial melting of subducted oceanic crust

Published on Jul 1, 2019in Ore Geology Reviews3.39
· DOI :10.1016/j.oregeorev.2019.102937
Jianghong Deng (CAS: Chinese Academy of Sciences), Xiaoyong Yang19
Estimated H-index: 19
(USTC: University of Science and Technology of China)
+ 4 AuthorsWeidong Sun47
Estimated H-index: 47
(CAS: Chinese Academy of Sciences)
Cite
Abstract
Abstract In the Philippine island arc system, there are widely developed Cenozoic arc volcanic rocks, adakites and large Cu-Au deposits. Besides, only two early Cretaceous adakitic intrusions have been found in the entire Philippines so far, i.e., the Lutopan Diorite and the adjacent Kansi diorites in the Cebu Island, Central Philippines. The Lutopan Diorite (diorite to quartz diorite in lithology) is the ore-forming intrusion of the giant Atlas porphyry Cu-Au deposit, which is the only Cretaceous porphyry deposit in the Philippines. In this study, geochronology and geochemistry of the Lutopan Diorite in the Carmen pit of Atlas porphyry Cu-Au deposit are investigated in detail, by comparing them with the previously studied Early Cretaceous Kansi diorites and arc volcanic rocks in Cebu Island, to reveal the petrogenesis and magma sources. The Carmen diorites are characterized by moderate SiO 2 and MgO contents, coupled with high Na 2 O and low K 2 O contents, LREE-enriched and listric REE distribution patterns, low Yb and Y contents, high Sr contents and thereby high Sr/Y ratios, and low ( 87 Sr/ 86 Sr)i (0.7037 - 0.7038), typical of modern island arc adakites. Zircon U-Pb ages of the Carmen diorites are 109 Ma - 107 Ma in the Early Cretaceous, which is identical with that of the Kansi diorite in the north within error. Both the Carmen and Kansi diorites were formed in intra-oceanic island arc settings. The Carmen diorites show listric REE patterns and low Nb/Ta, high Zr/Sm ratios, suggesting they are formed by partial melting of subducted oceanic crust in amphibolite facies, which is different from the garnet amphibolite- to amphibole eclogite-melting genesis of the Kansi diorites. There is a small amount of subducted sediments in the magma source of Carmen diorite, as further revealed by e N d (t) (+7.1 to +10.6), zircon e Hf (t) (+3.3 to +3.9) values, and low Th/U ratios. The Carmen adakitic magma did not undergo significant interaction with mantle peridotite during magma ascent as indicated by the moderate MgO content and Mg# value, and quite low Cr and Ni contents, distinguished from the Kansi diorite (high-Mg adakite) that have high MgO, Mg#, and Cr and Ni contents. We suggest that the nearly contemporary Lutopan Diorite and Kansi diorite are two independent Early Cretaceous adakitic intrusions in Cebu Island, although they are both closely associated with Cu-Au mineralization. The slab-melting genesis and high oxygen fugacities of the Lutopan Diorite are the most important factors to cause Cu enrichment in the magma, which is necessary to form the giant Atlas porphyry Cu-Au deposit.
  • References (144)
  • Citations (0)
Cite
References144
Newest
Published on Jun 1, 2018
Xin-lei Sun2
Estimated H-index: 2
(CAS: Chinese Academy of Sciences),
Weidong Sun47
Estimated H-index: 47
(CAS: Chinese Academy of Sciences)
+ 8 AuthorsZhaofeng Zhang13
Estimated H-index: 13
(CAS: Chinese Academy of Sciences)
Cenozoic adakitic rocks in the Gangdese changed from barren continental melts to ore-forming slab melts at ~ 23 Ma. The distribution and chemical characteristics of the ore-forming adakites point to an association with the Ninetyeast Ridge. The subduction of the thick, rigid Ninetyeast Ridge changed the geometry and rheology of the eastern Tibetan Plateau lithosphere and asthenosphere, restrained the eastward escape of asthenospheric mantle as well as continental fragments, and promoted the upli...
Published on Mar 1, 2018in Solid Earth Sciences
Weidong Sun47
Estimated H-index: 47
,
Lijun Liu17
Estimated H-index: 17
(UIUC: University of Illinois at Urbana–Champaign)
+ 9 AuthorsCong-ying Li17
Estimated H-index: 17
(CAS: Chinese Academy of Sciences)
Abstract The driving forces of plate motion, especially that of its sudden change over time, has long been debated. During the closure of an old ocean, the subduction process of the mid-ocean ridge provides valuable clues to quantitative evaluation of the driving forces of plate tectonics. Here we show that the drifting rates of the Indian plate were correlated with a Late Cretaceous adakitic event hosting abundant adakites and adakitic charnockites in the Gangdese belt, southern Tibetan Plateau...
Published on Jan 1, 2018in Ore Geology Reviews3.39
Jia Guo4
Estimated H-index: 4
(CAS: Chinese Academy of Sciences),
Rongqing Zhang12
Estimated H-index: 12
(CAS: Chinese Academy of Sciences)
+ 4 AuthorsJunde Wu1
Estimated H-index: 1
Abstract The Gaosong Sn–Cu deposit in the Gejiu ore district, SW China, is a large cassiterite–sulfide deposit, hosting total ore reserves of 67.4 Mt @1.3% Sn and 19.0 Mt @1.1% Cu. Two types of mineralization developed in the deposit, i.e. cassiterite-sulfide ore within the proximal skarn in contact with the Gaofengshan biotite granite, and fault-controlled stratiform-like cassiterite–iron oxide ± sulfide ore in the distal carbonate country rock. Cassiterite grains are disseminated in both ores....
Published on Oct 1, 2017in Lithos3.91
Lipeng Zhang7
Estimated H-index: 7
(CAS: Chinese Academy of Sciences),
Rongqing Zhang12
Estimated H-index: 12
(CAS: Chinese Academy of Sciences)
+ 6 AuthorsWeidong Sun47
Estimated H-index: 47
(CAS: Chinese Academy of Sciences)
Abstract The Xishan Sn–W deposit is spatially related to K-feldspar granites in the Yangchun basin, western Guangdong Province, South China. LA-ICP-MS zircon U–Pb dating for the Xishan pluton defines an emplacement age of ~ 79 Ma (78.1 ± 0.9 Ma; 79.0 ± 1.2 Ma; 79.3 ± 0.8 Ma), consistent with the mineralization age of the Xishan Sn–W deposit constrained by molybdenite Re–Os isochron age (79.4 ± 4.5 Ma) and LA-ICP-MS cassiterite U–Pb ages (78.1 ± 0.9 Ma and 79.0 ± 1.2 Ma) for the cassiterite-quart...
Published on Aug 1, 2017in Ore Geology Reviews3.39
Jianghong Deng5
Estimated H-index: 5
(USTC: University of Science and Technology of China),
Xiaoyong Yang19
Estimated H-index: 19
(USTC: University of Science and Technology of China)
+ 3 AuthorsWeidong Sun47
Estimated H-index: 47
(CAS: Chinese Academy of Sciences)
Abstract Early Cretaceous arc volcanic rocks, diorite intrusions and an associated large porphyry deposit occur in the Cebu Island, Central Philippines. In this paper, we studied the diorite porphyries associated with Cu-Au mineralization in the Kansi region, where Early Cretaceous arc volcanic rocks are widely distributed. Zircon U-Pb age reveals that the diorites were formed at ca. 110 Ma, close to the formation age of Lutopan diorites in the famous Atlas porphyry Cu-Au deposit (109–101 Ma), a...
Published on Jul 1, 2017in Journal of Asian Earth Sciences2.76
Graciano P. Yumul7
Estimated H-index: 7
,
Walter W. Brown1
Estimated H-index: 1
+ 11 AuthorsBarbie Ross B. Villaplaza1
Estimated H-index: 1
(UP: University of the Philippines Diliman)
Abstract The presence of adakites has been used as an indicator for the occurrence of gold mineralization in many mineral prospecting works. Traditionally, the unique geodynamic controls to adakite formation, particularly the high temperature gradient and other slab-melting requirements, have been taken as key elements that must be present during their formation. However, several studies have suggested alternative mechanisms. This paper presents fractional crystallization as the most viable mech...
Published on Jun 1, 2017in Geochimica et Cosmochimica Acta4.26
Chan-chan Zhang6
Estimated H-index: 6
(CAS: Chinese Academy of Sciences),
Weidong Sun47
Estimated H-index: 47
(CAS: Chinese Academy of Sciences)
+ 3 AuthorsKai Wu4
Estimated H-index: 4
(CAS: Chinese Academy of Sciences)
Abstract Oxygen fugacity ( f O 2 ) is a key factor that controls the formation of porphyry Cu deposits. Porphyry Cu deposits are typically oxidized, but when and how porphyry magmas gain their high oxygen fugacity signatures, and how oxygen fugacity controls porphyry mineralization, remains obscure. To trace the origin of the high oxygen fugacity in porphyry Cu deposits, we determined trace element compositions and U-Pb ages of magmatic and inherited zircon from Dexing porphyry Cu deposit, calcu...
Published on Jun 1, 2017
Lipeng Zhang7
Estimated H-index: 7
(CAS: Chinese Academy of Sciences),
Yongbin Hu7
Estimated H-index: 7
(CAS: Chinese Academy of Sciences)
+ 5 AuthorsWeidong Sun47
Estimated H-index: 47
(CAS: Chinese Academy of Sciences)
South China is famous for the extensive magmatism and polymetallic mineralization that took place there in the Mesozoic. Shilu is a large porphyry–skarn Cu–Mo deposit in the Yangchun Basin, South China. The lithology of the Shilu intrusion is granodiorite and quartz diorite, both of which are high-K calc-alkaline series, with high Sr (>400 ppm) content along with low Y and Yb contents. Most of the samples have characteristics of adakite except for a few samples that have slightly higher Y and Yb...
Published on Mar 1, 2017
Weidong Sun47
Estimated H-index: 47
(CAS: Chinese Academy of Sciences),
Jin-tuan Wang2
Estimated H-index: 2
(CAS: Chinese Academy of Sciences)
+ 6 AuthorsHuaying Liang10
Estimated H-index: 10
(CAS: Chinese Academy of Sciences)
Copper is a moderately incompatible chalcophile element. Its behavior is strongly controlled by sulfides. The speciation of sulfur is controlled by oxygen fugacity. Therefore, porphyry Cu deposits are usually oxidized (with oxygen fugacities > ΔFMQ +2) (Mungall 2002; Sun et al. 2015). The problem is that while most of the magmas at convergent margins are highly oxidized, porphyry Cu deposits are very rare, suggesting that high oxygen fugacity alone is not sufficient. Partial melting of mantle pe...
Published on Feb 1, 2017in Lithos3.91
Cong-ying Li17
Estimated H-index: 17
(CAS: Chinese Academy of Sciences),
Xi-Luo Hao5
Estimated H-index: 5
(SYSU: Sun Yat-sen University)
+ 4 AuthorsWeidong Sun47
Estimated H-index: 47
(CAS: Chinese Academy of Sciences)
Abstract The Luobuling porphyry Cu–Mo deposit belongs to the Late Cretaceous Zijinshan Cu–Au–Mo mineralization field in southeastern China. Due to intensive hydrothermal alteration and weathering, it is very difficult to collect fresh whole rock samples for geochemical and isotopic studies in Luobuling. Zircon and apatite are accessory minerals that are resistant to hydrothermal alterations. In this study, we compared the trace element and isotope compositions of zircon and apatite from ore-bear...