Research Article| September 01, 1978 Gravity results and emplacement geometry of the Sulawesi ultramafic belt, Indonesia Eli A. Silver; Eli A. Silver 1Earth Sciences Board and Center for Coastal Marine Studies, University of California, Santa Cruz, California 95065 Search for other works by this author on: GSW Google Scholar Yoko Joyodiwiryo; Yoko Joyodiwiryo 1Earth Sciences Board and Center for Coastal Marine Studies, University of California, Santa Cruz, California 95065 Search for other works by this author on: GSW Google Scholar Robert McCaffrey Robert McCaffrey 1Earth Sciences Board and Center for Coastal Marine Studies, University of California, Santa Cruz, California 95065 Search for other works by this author on: GSW Google Scholar Author and Article Information Eli A. Silver 1Earth Sciences Board and Center for Coastal Marine Studies, University of California, Santa Cruz, California 95065 Yoko Joyodiwiryo 1Earth Sciences Board and Center for Coastal Marine Studies, University of California, Santa Cruz, California 95065 Robert McCaffrey 1Earth Sciences Board and Center for Coastal Marine Studies, University of California, Santa Cruz, California 95065 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1978) 6 (9): 527–531. https://doi.org/10.1130/0091-7613(1978)6<527:GRAEGO>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 Eli A. Silver, Yoko Joyodiwiryo, Robert McCaffrey; Gravity results and emplacement geometry of the Sulawesi ultramafic belt, Indonesia. Geology 1978;; 6 (9): 527–531. doi: https://doi.org/10.1130/0091-7613(1978)6<527:GRAEGO>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 Preliminary results of gravity observations on the Southeast Arm of Sulawesi in eastern Indonesia provide evidence on the structure of the large ultramafic belt and associated melange units. Gravity highs at the schist-ultramafic contact indicate that the ultramafic rocks are very thick there, possibly dipping beneath the schist. The gravity effect of the ultramafic rocks decreases eastward away from the schist, and a gravity low over a large zone of limestone and melange requires a thick body of low density material, probably melange, to nearly surround the limestone blocks. The interpreted structure imposes constraints on models of emplacement of the ultramafic slab and is compatible with slicing off slivers of ocean crust and upper mantle in a subduction zone, but it is not compatible with obduction or with diapiric intrusion. Uplift of ultramafic rocks was aided initially by the presence of abundant low-density melange and, finally, by the collision of Sulawesi with the Banggai-Sula Islands. 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.