Volcanism accompanying back-arc basin development in the southwest Pacific

Gill, James B.; Stork, Allen; Whelan, Peter

doi:10.1016/0040-1951(84)90014-3

Cited by 72 publications

(28 citation statements)

References 29 publications

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“…Studies of the chronology and geochemistry of tephra deposits in the forearc-basin drill cores will contribute to the evaluation of these various models. Such studies will also test whether boninitic (Beccaluva et al, 1980), alkalic (Stern et al, 1984), and/or rhyodacitic (Gill et al, 1984;Fryer et al, 1985a) volcanism characterizes periods of arc rifting.…”

Section: Arc/forearc Developments Background To Sites 787 792 and 793mentioning

confidence: 99%

Introduction

Taylor¹

1990

Proceedings of the Ocean Drilling Program

102

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Section: Arc/forearc Developments Background To Sites 787 792 and 793mentioning

confidence: 99%

Introduction

Taylor¹

1990

Proceedings of the Ocean Drilling Program

102

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“…The chemical characteristics of the tephras from the PliocenePleistocene ages have low K 2 O contents similar to the keratophyre of the Paleozoic rift as well as low-K rhyolite in the rift area (Gill, 1981;Gill et al, 1984;Reagan and Meijer, 1984;Hawkins and Melchior, 1985;Brouxel et al, 1987;Hochstaedter et al, 1990aHochstaedter et al, , 1990b.…”

Section: Discussionmentioning

confidence: 99%

Correlation of Quaternary Tephras throughout the Izu-Bonin Areas

Fujioka¹,

Nishimura²,

Matsuo³

et al. 1992

Proceedings of the Ocean Drilling Program

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Quaternary marine tephras in the Izu-Bonin Arc offer significant information about explosive volcanic activities of the arc. Visual core descriptions, petrographic examinations, and chemical and grain-size analyses were conducted on tephras of backarc, arc, and forearc origin. Tephras are black and white and occur in simple and multiple modes with mixed and nonmixed ashes of black and white glass shards. The grain size distributions of the tephras are classified into three categories: coarse, white pumiceous, and fine white and black well-sorted types. The frequency of occurrence of the white and black tephras differs within the tectonic settings of the arc. Chemically, the Quaternary tephras in this region belong to low-alkali tholeiitic series with lower K 2 O and TiO 2 than normal ordinary arc volcanic materials. Several tephras from different sites along the forearc correlate with each other and with tephras in the Shikoku Basin site and with Aogashima volcanics. These volcanic ashes resemble those in other backarc rifting areas, such as in the Fiji, Okinawa (Ryukyu), and Mariana regions.

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“…Back-arc basalts display a broad range of chemi cal compositions, from N-MORB-like tholeiitic types (Ridley et al, 1974;Wood et al, 1981;Tarney et al, 1981;Marsh et al, 1980;Sharaskin et al, 1981), to basaltic types with island-arc or calc-alkaline affinity, sometimes within the same basin (Weaver Saunders and Tarney, 1979;Marcelot et al, 1983;Tarney et al, 1981;Wood et al, 1982;Fryer et al, 1982;Gill et al, 1984). The evolution from the first type to the second one is mainly marked by the enrichment of LREE and most LILE (Rb, K, Ba, Th) relative to HREE and HFSE (Nb, Ta, Zr, Hf, Ti, Y).…”

Section: Discussion and Implication For Evolution Of The Tyrrhenian Bmentioning

confidence: 99%

Petrology and Geochemistry of Basalts from the Vavilov Basin (Tyrrhenian Sea), Ocean Drilling Program Leg 107, Holes 651A and 655B

Bertrand¹,

Boivin²,

Robin³

1990

Proceedings of the Ocean Drilling Program

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During ODP Leg 107, two holes were drilled in the basement of Vavilov Basin, a central oceanic area of the Tyrrhe nian sea. Hole 655B is located near the Gortani ridge in off-axis position at the western rim of the basin; Hole 651A is located on a basement swell at the axis of the basin. This paper deals with mineral chemistry, major and trace element geochemistry, and petrogenesis of the basalts recovered in the two holes.The mineralogy of the basalts is broadly homogeneous, but all of them have suffered important seawater alteration. Their major-element compositions are similar to both normal-mid-ocean-ridge-basalts (N-MORB) and back-arc-basalts (BAB) except for Na 2 0 contents (BAB-like), and K 2 0 which is somewhat enriched in upper unit of Hole 651 A. Their affinity with N-MORB and BAB is confirmed by using immobile trace elements such as Zr, Y, and Nb. However, basalts from the two sites present contrasting geochemical characteristics on spidergrams using incompatible elements. Hole 655B basalts are homogeneous enriched tholeiites, similar to those from DSDP Hole 373 (located on the opposite side of the basin near the eastern rim), and show affinities with enriched MORB (E-MORB). At Hole 651 A, the two basalt units are chemically distinct. One sample recovered in lower unit is rather similar to those from Hole 655B, but basalts from upper unit display calc-alkaline characteristic evidenced by the increase of light-ion-lithophile-element (LILE)/ high-field-strength-element (HFSE) ratio, and appearance of a negative Nb-anomaly, making them comparable with orogenic lavas from the adjacent Eolian arc. The observed chemical compositions of the basalts are consistent with a derivation of the magmas from a N-MORB type source progressively contaminated by LILE-enriched fluids released from dehydration of the bordering subducted plate.Implications for evolution of the Tyrrhenian basin are tentatively proposed taking into consideration geochemical and chronological relationships between basalts from Leg 107 Holes 655B and 651 A, together with data from Leg 42 Site 373 and Vavilov Seamount. These data illustrate back-arc spreading in ensialic basin closely associated with the maturation of the adjacent subduction, followed by the growth of late off-axis central volcano, whereas the active sub duction retreats southeastward.

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Volcanism accompanying back-arc basin development in the southwest Pacific

Cited by 72 publications

References 29 publications

Introduction

Introduction

Correlation of Quaternary Tephras throughout the Izu-Bonin Areas

Petrology and Geochemistry of Basalts from the Vavilov Basin (Tyrrhenian Sea), Ocean Drilling Program Leg 107, Holes 651A and 655B

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