Tag: geochemistry

33 How do we know the asteroids formed at the same time as earth? 2014-11-19T21:36:03.787

23 Natural nuclear explosions 2014-06-20T06:26:25.517

22 Peak phosphorus - what are the sinks? 2014-04-22T08:04:43.140

21 Why does phosphate rock contain uranium? 2015-04-02T09:38:39.863

19 What are rare earths and why do they cluster near alkaline magmatism? 2014-04-17T23:42:57.933

19 What is the origin of the ocean's salt? 2014-12-05T13:21:06.663

19 How are Mauna Loa $\ce{CO2}$ monthly trends computed? 2015-02-04T14:45:30.083

18 Is the magma in one volcano different from the magma in every other volcano? 2015-07-28T02:57:59.990

17 What was the first rock in the rock cycle? 2015-03-24T05:55:44.937

16 How much Uranium is there in the Earth's Crust? 2014-04-16T06:37:16.277

16 Why is there Uranium in Earth's Crust? 2014-07-28T09:17:05.617

16 Why won't Yellowstone explode? 2014-08-19T18:09:42.057

16 What processes produced the basalt columns of the Giant's Causeway? 2015-05-17T11:51:03.400

15 When a tectonic plate subducts, does any of the subducted material melt, or is it just the mantle above the subducted slab that melts? 2014-05-22T12:57:14.247

13 Does the heating of the oceans due to greenhouse effect negate the acidification due to increased CO2 levels? 2014-08-28T21:36:03.960

13 What is it about ancient craton geology that results in associated kimberlite pipes containing economic diamond deposits? 2014-09-21T01:43:53.610

13 What, if any, paleoclimate data can be derived from igneous rocks? 2014-11-27T10:00:03.633

13 Why does aragonite form in one case and an acetate in another? 2015-04-03T13:06:24.747

12 What does groundwater consist of? 2014-07-18T06:04:54.657

12 Are there significant amounts of rare earth elements on Iceland? 2014-07-28T09:11:10.607

12 How much silicon is in the Earth's core, and how did it get there? 2014-10-17T19:08:35.517

12 What are the high field strength and large ion lithophile (HFS or HFSE & LIL or LILE) elements? 2014-12-04T07:29:44.537

12 Nuclear testing and the Anthropocene, a chemostratigraphic link? 2015-01-16T06:05:07.153

12 How is abundance of elements in the Earth's crust estimated? 2015-08-14T14:51:02.777

11 Use of Neodymium in Paleoceanography 2014-05-15T07:57:41.470

11 Why would a suite of related rocks have one anomalous sample? 2014-05-20T09:22:27.883

11 Why are titanium oxides lumped in with magnetite for the purposes of analyzing water bubble nucleation? 2014-09-04T18:55:49.813

11 Looking at ocean depth/latitude profiles of dissolved oxygen and nitrate. Why is dissolved oxygen low when nitrate is high? 2014-09-08T15:28:50.600

11 What is the mechanism behind changes in oxidation state (of iron, for example) as magma rises? 2014-09-16T13:44:55.997

11 Why do most opal deposits occur in Australia? 2015-03-21T18:30:39.997

11 Why is continental crust less dense than oceanic? 2015-06-03T15:20:06.283

10 What is the Calcite Compensation Depth and what is its significance for carbonate deposits? 2014-04-16T22:24:44.310

10 Why do Volcanoes give out so much Sulphur Dioxide and Carbon Dioxide? 2014-07-10T17:52:58.270

10 Which theory is stronger, that iron came from outside or was formed within earth? 2014-08-05T16:14:07.813

10 Why are alkali basalts found at rifting centres and on top of 'plumes', whereas MORBs are generally tholeiitic? 2014-09-06T23:22:39.113

10 Are there any metal anomalies other than iridium in the K-Pg boundary? 2014-11-10T12:15:29.733

10 Why would magma have high amounts of nickel and chromium? 2014-12-03T23:28:02.470

10 What does geochemical data tell us about Earth's earliest palaeoclimatic conditions? 2014-12-18T04:21:29.133

10 What is the geochemical origin of carbon dioxide with the 'white smokers' of the Champagne Vent? 2015-01-08T03:12:27.040

10 What is the geothermal potential of a volcano? 2015-05-08T16:39:06.207

9 How does the composition of volcanic rock change as it makes its ascent towards the surface? 2014-09-10T05:34:12.063

9 What makes the conditions at the core/mantle boundary ideal for aluminum to combine with other elements besides oxygen? 2014-09-12T01:00:50.827

9 What's the partition coefficient (D) of Nb for apatite? 2014-12-28T19:30:42.850

9 Did an impact crater influence the formation of uranium deposits in South Australia? 2015-03-25T14:10:41.363

9 Simplest formula of a calcium phosphate mineral? 2015-09-12T15:51:51.573

9 Is oxygen the most abundant element on Earth? 2016-03-07T14:43:50.510

8 What is the concentration of silver in tap or freshwater in the United kingdom 2014-04-29T16:03:52.523

8 How do archaeologists address time dilation when analyzing carbon dating results? 2014-11-12T18:55:11.133

8 Release mechanism for methane clathrate at the PETM 2014-11-21T12:06:26.930

8 Predicting volcanic eruptions by experimentally proven volatile outgassing observations 2015-02-13T10:15:32.757

8 Magma resultant from group 1 and group 2 elements? 2015-03-13T17:15:02.577

8 Why does Australia have extensive uranium ore deposits? 2015-03-26T10:19:32.930

8 Identifying serpentinite reworked during high-T metamorphism 2015-07-14T01:28:12.803

8 Why are the Little Colorado River and Havasu Creek blue? 2015-09-03T23:29:17.570

8 Are trends in crossplots of compositional data from different analyses valid? 2016-01-11T16:35:39.403

8 Melting basalt on the lunar surface - what would the resulting material be like? 2016-07-04T19:03:54.157

8 Are there minerals which are not been found on earth but which are still possible to exist? 2016-09-30T20:40:49.907

8 Is the iron on Earth's crust a leftover of the Iron catastrophe, or it was brought back by volcanoes? 2018-02-08T17:13:32.343

7 What is the geochemical source for the helium detected in deep Arctic explosive eruptions? 2015-01-20T09:20:28.557

7 Acidity of rock 2015-01-21T20:39:16.963

7 The different types of plagioclase 2015-01-23T10:47:17.993

7 What is the origin of the Laacher See caldera magma in Germany? 2015-02-07T16:24:40.913

7 Do different lavas have different volcanic volatiles associated with them? 2015-02-13T11:01:47.293

7 Recreating the rock cycle 2015-03-23T00:21:29.750

7 What ozone depleting chemicals can salt produce? 2015-03-24T04:23:40.640

7 Oxygen isotope ratio and Glaciers 2015-04-26T22:01:48.450

7 Why is hydrogen formation in serpentinisation an exothermic reaction? 2015-05-29T11:45:03.707

7 What type of rock is this paving stone and what is the origin of the red colouration? 2015-08-16T23:31:38.633

7 What are the dominant elements that oxygen is bonded to on earth? 2016-03-10T23:25:51.977

7 Diamond at the Core of Jupiter? 2017-01-22T00:30:00.840

7 What is the white coating "patina" we often see on deposited chalcedony/agate? 2017-02-03T14:30:47.297

7 What "g" would be needed to keep helium on Earth? 2017-02-22T21:06:16.403

7 What fraction of Earth's crustal material survives the supercontinent cycle? 2017-03-02T09:49:55.633

7 Where can fluorite be found on Long Island, New York? 2017-05-11T02:23:18.750

7 Please help in understanding redox buffers 2018-03-10T22:17:18.137

6 What is the mechanism for deep-sea volcanism of the Gakkel Ridge in the Arctic? 2015-01-30T22:17:46.013

6 Mars maar craters explosive style formation gravitational effect 2015-06-30T15:53:23.257

6 What is the ratio of infra-red light absorbed by green house gases? 2015-09-07T09:53:11.793

6 Define components of mineral assemblage? 2015-09-30T21:16:56.030

6 Plotting a mineral stability diagram 2015-10-04T13:08:38.573

6 What was the likely composition of Earth's early crust (how did crustal composition evolve)? 2015-11-10T07:09:42.153

6 How do hematite and magnetite form? 2015-11-12T16:25:30.600

6 A simple formulation to calculate the sequence and rate of salt precipitation in a brine? 2016-01-08T15:21:01.307

6 Why silicon is abundant in earth surface? 2016-03-29T06:52:05.450

6 What is the CI chondrite concentration of REEs/rare metals, in ppm/grams per ton? 2016-10-27T15:19:32.060

6 Abiogenesis: Formation of Lipids from Montmorillonite 2017-05-18T23:49:03.143

6 What controls the acidity of the ocean? 2017-12-18T02:00:20.790

6 Chloride and evaporation 2018-01-13T04:33:56.303

6 Carbon's role in ocean acidification 2018-04-05T12:30:23.203

6 Historically, how did the total amount of salt / NaCl on Earth develop? 2018-09-20T23:01:33.327

6 If the study of "minerals" is covered by inorganic chemistry 2018-11-01T17:36:52.477

5 Why is my ♦ hammer (i.e. diamond) so durable, but it can burn? 2014-04-16T21:11:47.210

5 Why is seawater saline? 2015-03-06T03:32:11.463

5 Age of fossils found in rocks 2015-09-03T15:44:22.943

5 Are all natural diamonds made of organic carbon material? 2016-02-08T10:33:13.823

5 Marine and freshwater geochemistry 2016-03-06T10:29:15.720

5 Looking for a complete table of minerals for a database 2016-05-06T02:05:32.337

5 Upon breaking apart andesite, what do you get? 2016-06-02T00:09:22.057

5 What reactions change seawater composition in hydrothermal systems? 2017-01-12T16:22:07.610