Kushiro, I (1982): Petrology of high-MgO bronzite andesite resembling boninite at DSDP Hole 60-458 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.820211, Supplement to: Kushiro, I (1982): Petrology of high-MgO bronzite andesite resembling boninite from Site 458 near the Mariana Trench. In: Hussong, DM; Uyeda, S; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 60, 731-733, https://doi.org/10.2973/dsdp.proc.60.139.1982
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Abstract:
A high-MgO andesite which is texturally similar to boninite and a variolitic basalt collected from Site 458, about 100 km west of the Mariana Trench, have been studied through microprobe analyses and melting experiments at high water pressures. The boninite-type andesite is very similar in composition and texture to a boninite from Bonin Islands, except that the former is more calcic than the latter. The variolitic basalt contains magnesian pigeonite (Ca12Mg74Fe14) in cores of augite microphenocrysts. This pigeonite crystallized at temperatures above 1200°C. In the melting experiments of the boninite-type rock, clinopyroxene crystallizes as a liquidus phase at pressures at least above 8 kbar. No olivine crystallizes near the liquidus temperatures, indicating that the magma of this rock cannot be in equilibrium with the upper mantle periodotite (lherzolite) at depths at least greater than 25 km. The boninite-type rock is probably a product of fractional crystallization of a more primitive magma (e.g., olivine-bearing boninite magma) by separation of olivine and orthopyroxene. The magma of the variolitic basalt also cannot be in equilibrium with the upper mantle peridotite, and may be a product of fractional crystallization of a more primitive basaltic magma.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 17.864200 * Longitude: 146.934300
Date/Time Start: 1978-04-18T00:00:00 * Date/Time End: 1978-04-18T00:00:00
Event(s):
60-458 * Latitude: 17.864200 * Longitude: 146.934300 * Date/Time: 1978-04-18T00:00:00 * Elevation: -3447.0 m * Penetration: 465.5 m * Recovery: 97.6 m * Location: North Pacific/TRENCH * Campaign: Leg60 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 46 cores; 437 m cored; 28.5 m drilled; 22.3 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Kushiro, I (1982): (Table 1) Chemical compositions of boninite and basalt at DSDP Hole 60-458. https://doi.org/10.1594/PANGAEA.820209
- Kushiro, I (1982): (Table 2) Tests made on boninite and variolitic basalt sediments at DSDP Hole 60-458. https://doi.org/10.1594/PANGAEA.820210