Abstract
Isla Tortuga is a small isolated central volcano which is located near an actively spreading trough in the Gulf of California. The basalt lavas from Tortuga which have the highest Mg/Fe and Ni contents have trace element abundances and ratios and /sup 87/Sr//sup 86/Sr which are similar to those of mid-ocean ridge tholeiite. The major element, rare earth element and Sr abundances of fractionated tholeiite (low Mg/Fe) and tholeiite andesite of Tortuga are consistent with an origin by closed-system fractional crystallization. This hypothesis is not supported by K, Na, Rb and Ba abundances in the lavas nor by their variable /sup 87/Sr//sup 86/Sr (0.7024 to 0.7035). It is proposed that the apparent decoupling of light rare earth elements, other incompatible trace elements and /sup 87/Sr//sup 86/Sr is due to contamination of some Tortuga magmas while they are fractionated in a high-level crustal magma chamber. The mantle source of least-contaminated, high Mg/Fe basalt lavas of Tortuga is similar, although not identical to the source of normal mid-ocean ridge tholeiite; significant differences exist. The reasons for these differences are not yet known.
Batiza, R;
[1]
Futa, K;
Hedge, C E
[2]
- Washington Univ., St. Louis, MO (USA). McDonnell Center for the Space Sciences
- Geological Survey, Denver, CO (USA)
Citation Formats
Batiza, R, Futa, K, and Hedge, C E.
Trace element and strontium isotope characteristics of volcanic rocks from Isla Tortuga: a young seamount in the Gulf of California.
Netherlands: N. p.,
1979.
Web.
doi:10.1016/0012-821X(79)90211-5.
Batiza, R, Futa, K, & Hedge, C E.
Trace element and strontium isotope characteristics of volcanic rocks from Isla Tortuga: a young seamount in the Gulf of California.
Netherlands.
https://doi.org/10.1016/0012-821X(79)90211-5
Batiza, R, Futa, K, and Hedge, C E.
1979.
"Trace element and strontium isotope characteristics of volcanic rocks from Isla Tortuga: a young seamount in the Gulf of California."
Netherlands.
https://doi.org/10.1016/0012-821X(79)90211-5.
@misc{etde_5791093,
title = {Trace element and strontium isotope characteristics of volcanic rocks from Isla Tortuga: a young seamount in the Gulf of California}
author = {Batiza, R, Futa, K, and Hedge, C E}
abstractNote = {Isla Tortuga is a small isolated central volcano which is located near an actively spreading trough in the Gulf of California. The basalt lavas from Tortuga which have the highest Mg/Fe and Ni contents have trace element abundances and ratios and /sup 87/Sr//sup 86/Sr which are similar to those of mid-ocean ridge tholeiite. The major element, rare earth element and Sr abundances of fractionated tholeiite (low Mg/Fe) and tholeiite andesite of Tortuga are consistent with an origin by closed-system fractional crystallization. This hypothesis is not supported by K, Na, Rb and Ba abundances in the lavas nor by their variable /sup 87/Sr//sup 86/Sr (0.7024 to 0.7035). It is proposed that the apparent decoupling of light rare earth elements, other incompatible trace elements and /sup 87/Sr//sup 86/Sr is due to contamination of some Tortuga magmas while they are fractionated in a high-level crustal magma chamber. The mantle source of least-contaminated, high Mg/Fe basalt lavas of Tortuga is similar, although not identical to the source of normal mid-ocean ridge tholeiite; significant differences exist. The reasons for these differences are not yet known.}
doi = {10.1016/0012-821X(79)90211-5}
journal = []
volume = {43:2}
journal type = {AC}
place = {Netherlands}
year = {1979}
month = {May}
}
title = {Trace element and strontium isotope characteristics of volcanic rocks from Isla Tortuga: a young seamount in the Gulf of California}
author = {Batiza, R, Futa, K, and Hedge, C E}
abstractNote = {Isla Tortuga is a small isolated central volcano which is located near an actively spreading trough in the Gulf of California. The basalt lavas from Tortuga which have the highest Mg/Fe and Ni contents have trace element abundances and ratios and /sup 87/Sr//sup 86/Sr which are similar to those of mid-ocean ridge tholeiite. The major element, rare earth element and Sr abundances of fractionated tholeiite (low Mg/Fe) and tholeiite andesite of Tortuga are consistent with an origin by closed-system fractional crystallization. This hypothesis is not supported by K, Na, Rb and Ba abundances in the lavas nor by their variable /sup 87/Sr//sup 86/Sr (0.7024 to 0.7035). It is proposed that the apparent decoupling of light rare earth elements, other incompatible trace elements and /sup 87/Sr//sup 86/Sr is due to contamination of some Tortuga magmas while they are fractionated in a high-level crustal magma chamber. The mantle source of least-contaminated, high Mg/Fe basalt lavas of Tortuga is similar, although not identical to the source of normal mid-ocean ridge tholeiite; significant differences exist. The reasons for these differences are not yet known.}
doi = {10.1016/0012-821X(79)90211-5}
journal = []
volume = {43:2}
journal type = {AC}
place = {Netherlands}
year = {1979}
month = {May}
}