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259:. However, the government has had to institute water rationing during the dry season from May to October. Beginning in 2009, the Seychelles government took interest in groundwater as a backup supply in fractured granite bedrock, looking to the example of granite aquifers in Sweden and commercial water companies such as Gondwana Water Drilling Company, which drilled eight test wells in the 1990s.
41:
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as between two and six kilometers of clastic sediments accumulated on the western margin of the
Seychelles microcontinent. Along the passive northwest margin with Gondwana, the coastline was submerged and one kilometer of fine sediments deposited there as the Somali oceanic basin formed.
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within the past 145 million years and become isolated in the Indian Ocean. The islands are primarily granite rock, with some sequences of sedimentary rocks formed during rift basin periods or times when the islands were submerged in shallow water.
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mining industry until the 1980s and has ongoing exploration for offshore oil and gas. Currently, there is no mining in
Seychelles except quarrying for clay, coral and sand to use as building material.
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East
Gondwana fragmented 120 million years ago, splitting up Antarctica-Australia and Madagascar-Seychelles-India, which ultimately separated 85 million years ago as the
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Seychelles sources most of its water from rainfall and desalination and receives 2300 millimeters of precipitation every year. Surface water is stored by the
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through a process of rift and drift tectonics. The microcontinent was uplifted, eroded and impacted by volcanic eruptions.
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hotspot, which poured out immense basalt flows in India 65 million years ago and ultimately formed islands such as
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The microcontinent was confined between northern
Madagascar and western India until the
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450:"Seychelles aims at making ground water the islands' second source of water"
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146:. Much of the rock is gray granite, while in southwest it is a pink
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first published an account of the geology of the archipelago, while
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rocks emplaced to become the
Silhouette and ĂŽle du Nord islands.
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Geology and
Mineral Resources of the Seychelles Archipelago
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336:"The extent of continental crust beneath the Seychelles"
188:. The rifting process stalled and then continued in the
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microcontinent that broke off from the supercontinent
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462:: CS1 maint: multiple names: authors list (
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448:Fardial, F. & Bonnelame, B. (2015).
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176:The rifting apart of the supercontinent
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334:; Collier, J.S.; Rumpker, G. (2013).
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340:Earth and Planetary Science Letters
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142:, with the rock dated as 748-755
804:Sahrawi Arab Democratic Republic
574:Democratic Republic of the Congo
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115:Seychelles began to form in the
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30:
108:cited the area as evidence of
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410:. Springer. pp. 216–217.
267:Seychelles had a small scale
387:. Geological Survey of Kenya
239:, around 61-67 Ma, alkaline
126:. Granite is the bedrock of
160:, trending WNW-ESE, in the
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408:Geological Atlas of Africa
361:10.1016/j.epsl.2013.08.023
97:Stratigraphy and tectonics
406:SchlĂĽter, Thomas (2008).
153:The granites were cut by
559:Central African Republic
263:Natural resource geology
68:, D- Present Day (right)
352:2013E&PSL.381..166H
228:and evolved during the
216:, isolated Seychelles.
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903:Geology of Seychelles
719:SĂŁo TomĂ© and PrĂncipe
579:Republic of the Congo
22:Map of the Seychelles
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378:Baker, B.H. (1963).
302:Central Indian Ridge
184:created failed rift
794:States with limited
81:is an example of a
505:Geology of Africa
172:Paleozoic-Mesozoic
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821:other territories
594:Equatorial Guinea
330:Hammond, J.O.S.;
220:Mesozoic-Cenozoic
150:form of granite.
110:continental drift
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881:(United Kingdom)
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873:Ascension Island
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194:Middle Jurassic
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289:Geology portal
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124:microcontinent
117:Neoproterozoic
106:Alfred Wegener
102:Charles Darwin
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56:(left) and A-
50:Early Jurassic
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869:Saint Helena
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389:. Retrieved
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343:
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253:La Gogue dam
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247:Hydrogeology
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206:Deccan Traps
204:formed. The
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180:in the Late
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796:recognition
749:South Sudan
639:Ivory Coast
452:. Elsevier.
346:: 166–176.
162:Precambrian
76:geology of
52:breakup of
851:(Portugal)
809:Somaliland
729:Seychelles
694:Mozambique
679:Mauritania
664:Madagascar
619:The Gambia
554:Cape Verde
308:References
257:Rochon dam
192:until the
164:and early
78:Seychelles
684:Mauritius
458:cite news
210:Mauritius
182:Paleozoic
155:doleritic
66:Paleocene
897:Category
875: /
871: /
864:(France)
858: /
836: /
832: /
784:Zimbabwe
759:Tanzania
609:Ethiopia
604:Eswatini
584:Djibouti
549:Cameroon
534:Botswana
275:See also
255:and the
237:Cenozoic
230:Cenozoic
190:Triassic
178:Gondwana
166:Tertiary
148:porphyry
136:La Digue
90:Gondwana
54:Gondwana
860:RĂ©union
856:Mayotte
847:Madeira
842:(Spain)
838:Melilla
769:Tunisia
739:Somalia
724:Senegal
709:Nigeria
699:Namibia
689:Morocco
654:Liberia
649:Lesotho
599:Eritrea
569:Comoros
544:Burundi
519:Algeria
391:14 July
348:Bibcode
241:igneous
214:RĂ©union
186:grabens
140:Fregate
132:Praslin
121:granite
86:granite
879:
862:
849:
779:Zambia
774:Uganda
714:Rwanda
669:Malawi
629:Guinea
524:Angola
83:felsic
834:Ceuta
754:Sudan
704:Niger
659:Libya
644:Kenya
624:Ghana
614:Gabon
589:Egypt
529:Benin
385:(PDF)
269:guano
158:dykes
119:as a
60:, B-
764:Togo
674:Mali
564:Chad
464:link
393:2019
212:and
138:and
128:Mahe
74:The
64:, C-
356:doi
344:381
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460:}}
456:{{
428:^
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316:^
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144:Ma
134:,
130:,
112:.
497:e
490:t
483:v
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395:.
364:.
358::
350::
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
