Flows with 'Cu-type' characteristics at ODP Hole 104-642E (Table 1)

Native Cu occurs in amygdules, fractures and groundmass of tholeiites from Ocean Drilling Program Site 642 on the Vøring Plateau. Similar occurrences have been reported in other tholeiites of the early Tertiary North Atlantic Volcanic Province drilled at Deep Sea Drilling Project Sites 342 on the Vø...

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Bibliographic Details
Main Author: LeHuray, A P
Format: Dataset
Language:English
Published: PANGAEA 1989
Subjects:
104-642E
DRILL
Drilling/drill rig
DSDP/ODP/IODP sample designation
Joides Resolution
Layer thickness
Leg104
Norwegian Sea
Number
Ocean Drilling Program
ODP
Sample code/label
Sample code/label 2
Vøring Plateau
Rockall Plateau
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.737392
https://doi.org/10.1594/PANGAEA.737392
Description
Summary:Native Cu occurs in amygdules, fractures and groundmass of tholeiites from Ocean Drilling Program Site 642 on the Vøring Plateau. Similar occurrences have been reported in other tholeiites of the early Tertiary North Atlantic Volcanic Province drilled at Deep Sea Drilling Project Sites 342 on the Vøring Plateau and 553 on the Rockall Plateau. The flows containing the native Cu have distinctive alteration patterns characterized by the combination of reddened flow tops, distinctive pastel coloration of the upper parts of the flows, relative abundance of celadonite, and the presence of native Cu. These associations suggest that subaerial weathering and subsequent seawater-basalt interaction are related to the occurrence of native Cu. An additional factor may be the increase in compatibility of Cu in silicates and Fe- Ti oxides that may accompany sub-solidus oxidation of basaltic flows. Native Cu occurrences in Site 642 tholeiites have some striking similarities to the large native Cu deposits in the Precambrian basalts of the Keweenaw Peninsula, Michigan, that are suggestive of similar mineralization processes.

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