Essays about: "mantle"

Showing result 1 - 5 of 46 essays containing the word mantle.

1. 1. Magmatic processes and storage beneath Heard Island, southern Indian Ocean

   University essay from Uppsala universitet/Institutionen för geovetenskaper

   Author : Liu Chun Wei; [2023]
   Keywords : Heard Island; Clinopyroxene; Thermobarometry; Magma storage depth;

   Abstract : A young marine island called Heard Island is located in the southern Kerguelen Plateau in the Indian Ocean, a large igneous province created by the Kerguelen mantle plume. The two major geographic regions on Heard Island have two principal volcano-magmatic suites. READ MORE

3. 2. Petrography and Mineral Chemistry of the Sälskär Breccia (Alnö Alkaline Complex, Central Sweden)

   University essay from Uppsala universitet/Institutionen för geovetenskaper

   Author : Vincent Gustafsson; [2022]
   Keywords : Alnö alkaline complex; diatreme; melilitite; pelletal lapilli; volcanic breccia; Alnö alkalina område; diatrem; melilitit; pelletal lapilli; vulkanisk breccia;

   Abstract : Primitive magmas can provide important details about the mantle from which they are derived. In this thesis, petrographic observations and new mineral chemistry analyses of the Sälskär breccia from the Alnö alkaline complex, central Sweden, are reported. READ MORE

4. 3. Lejarfjället Garnet(?) Peridotite – Origin and Petrological Characterization of Symplectitic Aggregates in Ultramafic Rocks

   University essay from Uppsala universitet/Mineralogi, petrologi och tektonik

   Author : Felicia Eriksson; [2022]
   Keywords : ultramafic; high-pressure metamorphism; peridotite; garnet breakdown; Scandinavian Caledonides; ultramafisk; högtrycks metamorfos; peridotit; granat; skandinaviska kaledoniderna;

   Abstract : Ultramafic rocks are abundant in the Earth’s mantle but rare on the surface. Since no in-situ samples from the mantle can be collected, mantle rocks provide knowledge of mechanisms operating in the mantle and large-scale processes that brought them up to the surface. READ MORE

5. 4. The “ultramafic” Intrusion’s within the peridotite from Härbergsdalen : Petrological characterization of infiltration record within the lithospheric mantle

   University essay from Uppsala universitet/Mineralogi, petrologi och tektonik

   Author : Per Volter; [2022]
   Keywords : ;

   Abstract : The mantle constitutes ~80% of Earths volume, however, due to its location deep beneath Earth’s surface the mantle is inaccessible to study in situ. Despite this, we still have information about its composition thanks to seismic studies which haven proven the mantle to be in generally homogenous and dominated by a rock called peridotite. READ MORE

6. 5. Modelling the global water cycle – the effect of Mg-sursassite on the amount of globally subducted water

   University essay from Göteborgs universitet/Institutionen för geovetenskaper

   Author : Nils Benjamin Gies; [2021-07-05]
   Keywords : ;

   Abstract : Subduction of hydrated lithospheric mantle is the most important process regarding the transfer of significant amounts of water to depths exceeding 350 km. Hence, the interplay of the thermal structure within the subducted slab together with the PT-stability fields of hydrous ultra-high pressure phases control the dehydration of the slab and the amount of water transported into the deeper mantle. READ MORE