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Geochemistry of late Cenozoic lavas from eastern Indonesia: Role of subducted sediments in petrogenesis

1977; Geological Society of America; Volume: 5; Issue: 9 Linguagem: Inglês

10.1130/0091-7613(1977)5 2.0.co;2

1943-2682

David Whitford, W. Compston, I.A. Nicholls, M. J. Abbott,

Geological and Geochemical Analysis

Research Article| September 01, 1977 Geochemistry of late Cenozoic lavas from eastern Indonesia: Role of subducted sediments in petrogenesis D. J. Whitford; D. J. Whitford 1Research School of Earth Sciences, Australian National University, Canberra, A.C.T., Australia Search for other works by this author on: GSW Google Scholar W. Compston; W. Compston 1Research School of Earth Sciences, Australian National University, Canberra, A.C.T., Australia Search for other works by this author on: GSW Google Scholar I. A. Nicholls; I. A. Nicholls 1Research School of Earth Sciences, Australian National University, Canberra, A.C.T., Australia Search for other works by this author on: GSW Google Scholar M. J. Abbott M. J. Abbott 2School of Earth Sciences, Flinders University, Bedford Park, South Australia Search for other works by this author on: GSW Google Scholar Geology (1977) 5 (9): 571–575. https://doi.org/10.1130/0091-7613(1977)5 2.0.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation D. J. Whitford, W. Compston, I. A. Nicholls, M. J. Abbott; Geochemistry of late Cenozoic lavas from eastern Indonesia: Role of subducted sediments in petrogenesis. Geology 1977;; 5 (9): 571–575. doi: https://doi.org/10.1130/0091-7613(1977)5 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The eastern Sunda and Banda arcs are characterized by an anomalous tectonic setting when compared with most other island arcs. Although the volcanic arc appears to be underlain by oceanic crust, the trough and sea floor beyond appear to be underlain by relatively thick continental crust. Late Cenozoic basaltic volcanic rocks from Solor in the west to Serua in the east are characterized by a primitive tholeiitic geochemistry, whereas associated more silicic rocks are anomalously rich in alkalis, especially potassium. 87Sr/86Sr ratios are all high relative to those from the western Sunda arc; they range from 0.7054 (Pura Beser) to 0.7091 (Maupura and Serua). Subduction and subsequent involvement in magma genesis of either sediments or continental crust seems the most plausible explanation. This model may also explain some of the tectonic peculiarities of the region, including the present gap in active volcanism north of Timor and the strong Holocene vertical uplift in the region. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.