Ambient and excess mantle temperatures, olivine thermometry, and active vs. passive upwelling

Tax Avoidance and Institutional Ownership: Active vs. Passive Ownership

Income tax is one of the most important costs of companies and it is usually considered as a cost that should not be paid. One of the most noticeable and influential factors in tax avoidance is corporate ownership structure. With an emphasis on institutional ownership and its types in this paper, it is attempted to measure the effect of this ownership and its types on corporate tax avoidance. F...

The temperature of the Icelandic mantle from olivine-spinel aluminum exchange thermometry

New crystallization temperatures for four eruptions from the Northern Volcanic Zone of Iceland are determined using olivine-spinel aluminum exchange thermometry. Differences in the olivine crystallization temperatures between these eruptions are consistent with variable extents of cooling during fractional crystallization. However, the crystallization temperatures for Iceland are systematically...

Spinel–olivine magnesium isotope thermometry in the mantle and implications for the Mg isotopic composition of Earth

Temperatures in Ambient Mantle and Plumes: Constraints from Basalts, Picrites, and Komatiites

[1] Several methods have been developed to assess the thermal state of the mantle below oceanic ridges, islands, and plateaus, on the basis of the petrology and geochemistry of erupted lavas. One leads to the conclusion that mantle potential temperature (i.e., TP) of ambient mantle below oceanic ridges is 1430 C, the same as Hawaii. Another has ridges with a large range in ambient mantle potent...

Mantle thermal structure and active upwelling during continental breakup in the North Atlantic

Seismic reflection and refraction data acquired on four transects spanning the Southeast Greenland rifted margin and Greenland^Iceland Ridge (GIR) provide new constraints on mantle thermal structure and melting processes during continental breakup in the North Atlantic. Maximum igneous crustal thickness varies along the margin from s 30 km in the near-hotspot zone (6 500 km from the hotspot tra...