Composition and timing of carbonate vein precipitation within the igneous basement of the Early Cretaceous Shatsky Rise, NW Pacific.

Li, Sanzhong, Geldmacher, Jörg , Hauff, Folkmar, Garbe-Schönberg, Dieter, Yu, Shan, Zhao, Shujuan and Rausch, Svenja (2014) Composition and timing of carbonate vein precipitation within the igneous basement of the Early Cretaceous Shatsky Rise, NW Pacific. Open Access Marine Geology, 357 . pp. 321-333. DOI 10.1016/j.margeo.2014.09.046.

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Supplementary data:

Abstract

Numerous calcium carbonate veins were recovered from the igneous basement of the Early Cretaceous Shatsky
Rise during Integrated Ocean Drilling Program (IODP) Expedition 324. The chemical (Sr/Ca, Mg/Ca) and isotopic
(87Sr/86Sr, 143Nd/144Nd, !18O, !13C) compositions of these veins were determined to constrain the timing of vein
formation. A dominant control by seawater chemistry on calcite composition is evident for most vein samples
with variable contributions fromthe basaltic basement. Slightly elevated precipitation temperatures (as inferred
from oxygen isotope ratios), indicative of hydrothermal vein formation, are only observed at Site U1350 in the
central part of Shatsky Rise. The highest 87Sr/86Sr ratios (least basement influence) of vein samples at each drill
site range from 0.70726 to 0.70755 and are believed to reflect the contemporaneous seawater composition
during the time of calcite precipitation. In principle, age information can be deduced by correlating these ratios
with the global seawater Sr isotope evolution. Since the Sr isotopic composition of seawater has fluctuated
three times between the early and mid Cretaceous, no unambiguous precipitation ages can be constrained by
this method and vein precipitation could have occurred at any time between ~80 and 140 Ma. However, based
on combined chemical and isotopic data and correlations of vein compositionwith formation depth and inferred
temperature, we argue for a rather early precipitation of the veins shortly after basement formation at each
respective drill site.

Document Type: Article
Additional Information: WOS:000346542700024
Keywords: ODP Expedition 324; JOIDES Resolution; Shatsky Rise; Calcite vein; Strontium isotope ratio; δ18O
Research affiliation: Kiel University
OceanRep > The Future Ocean - Cluster of Excellence > FO-R09
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.margeo.2014.09.046
ISSN: 0025-3227
Projects: IODP, Future Ocean
Expeditions/Models/Experiments:
Date Deposited: 27 Oct 2014 14:01
Last Modified: 23 Jun 2017 07:31
URI: http://oceanrep.geomar.de/id/eprint/25863

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