Heft, Kerri L. (2002): The compositional variability of altered upper oceanic crust; insights from the Troodos Ophiolite. georefid:2004-012624

Abstract:

Drill core CY-1, located in a down-welling region of the ancient hydrothermal system in the Troodos ophiolite, extends 474 m into the extrusive volcanic sequence. The bulk composition of CY-1 is compared with bulk compositions of surrounding locations, as well as in situ ocean crust to determine both variability within the CY-1 core and Cyprus, as well as how representative the CY-1 bulk composition is of in situ ocean crust. The bulk chemistry of the CY-1 drill core was calculated in two ways, first without considering secondary minerals or porosity, and second considering both porosity and the secondary minerals filling void space. Compared with fresh glass compositions, the volcanics of CY-1 exhibit an increase in MgO, K (sub 2) O, P (sub 2) O (sub 5) , Rb, Ni, Co, Th, and La, such trends were also evident in in-situ ocean crust at DSDP and ODP Sites 504B, 896A, 417A, and 418D. Decreases in SiO2 Al (sub 2) O (sub 3) , FeO (sub total) , CaO, Na (sub 2) O, and Sr concentration were apparent in the CY-1 drill hole as well as the DSDP and ODP drill sites.

Coverage:

West: -83.4357 East: 34.3000 North: 35.4000 South: 1.1301

West: NaN East: NaN North: NaN South: NaN

Relations:

Expedition: 102

Site: 102-418

Expedition: 111

Site: 111-504

Expedition: 137

Site: 137-504

Expedition: 140

Site: 140-504