[meteorite-list] Impact origin for the greater Ontong Java Plateau?

From: Paul <lenticulina1_at_meteoritecentral.com>
Date: Thu Apr 22 10:32:05 2004
Message-ID: <20040122150128.10388.qmail_at_web61010.mail.yahoo.com>

There is a new paper in Earth and Planetary
Science Letters that argues that the Ontong
Java Plateau in the Pacific Ocean was created
by a meteorite impact. The paper is:

Stephanie Ingle and Millard F. Coffin, 2004,
Impact origin for the greater Ontong Java
Plateau? Earth and Planetary Science
Letters. vol. 218, no. 1-2, pp. 123-134
(30 January 2004)

In part, the abstract stated:

"Geophysical, geochemical, and geodynamic
evidence from the province are difficult to
reconcile with mantle plume models; absence
of an obvious hotspot source or track, minor
crustal uplift associated with emplacement,
minor total subsidence compared with normal
oceanic crust or other oceanic plateaus and
submarine ridges, high degrees of melting
at shallow, upper mantle depths, low water
contents of basalts, enrichment of platinum
group elements in basalts, and a ~300 km
deep, seismically slow mantle root are
more consistent with the consequences of
an impacting bolide."

Yorus,

Paul
Baton Rouge, LA

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Received on Thu 22 Jan 2004 10:01:28 AM PST