Composition of chromian diopside megacryst in DSDP Leg 37 basalts (Table 2, 3)

Refractory megacrysts of olivine, plagioclase, chromian diopside and Cr-Al spinel, which were not in equilibrium with the host oceanic tholeiite on eruption, are present in samples from several dredge sites and DSDP drill sites in the Atlantic and Pacific Oceans. They have multiple origins: (1) cogn...

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Bibliographic Details
Main Authors: Donaldson, Colin H, Brown, Roy W
Format: Dataset
Language:English
Published: PANGAEA 1977
Subjects:
37-332A
37-332B
37-335
Aluminium oxide
Calcium oxide
Chromium
Chromium(III) oxide
Deep Sea Drilling Project
DRILL
Drilling/drill rig
DSDP
DSDP/ODP/IODP sample designation
Elevation of event
Enstatite
Event label
Ferrosilite
Glomar Challenger
Iron oxide
Fe2O3
FeO
Latitude of event
Leg37
Lithology/composition/facies
Longitude of event
Magnesium number
Magnesium oxide
Manganese oxide
North Atlantic
North Atlantic/VALLEY
Potassium oxide
Sample code/label
Silicon dioxide
Sodium oxide
Titanium dioxide
Wollastonite
Greenland
Pacific
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.708792
https://doi.org/10.1594/PANGAEA.708792
Description
Summary:Refractory megacrysts of olivine, plagioclase, chromian diopside and Cr-Al spinel, which were not in equilibrium with the host oceanic tholeiite on eruption, are present in samples from several dredge sites and DSDP drill sites in the Atlantic and Pacific Oceans. They have multiple origins: (1) cognate or accidental mantle fragments; (2) relict fragments from fractional crystallization of parental liquids considerably more primitive than oceanic tholeiite; and most commonly (3) the fractional crystallization products of such liquids mixed with oceanic tholeiite magma. Melt inclusions in chrome-spinel phenocrysts provide evidence for this postulated Mg- and Ca-rich magma which has counterparts in the Scottish Tertiary Province and in west Greenland.

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