The emplacement of peridotites and associated oceanic rocks from the Lizard Complex, Southwest England

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doi: 10.1017/S0016756801005933
Authors:Cook, C. A.; Holdsworth, R. E.; Styles, M. T.
Author Affiliations:Primary:
University of Durham, Department of Geological Sciences, Durham, United Kingdom
Other:
British Geological Survey, United Kingdom
Volume Title:Geological Magazine
Source:Geological Magazine, 139(1), p.27-45. Publisher: Cambridge University Press, London, United Kingdom. ISSN: 0016-7568
Publication Date:2002
Note:In English. 58 refs.; illus., incl. sects., block diags., 1 table, geol. sketch map
Summary:Upper mantle peridotites and associated oceanic rocks from the Lizard complex preserve evidence for a multistage geological history. Steeply dipping pre-emplacement fabrics record high-T (900-1100°C) shearing and exhumation of the mantle peridotites apparently formed during localized rifting in a pull-apart basin setting (∼ 400-390 m.y.). Associated oceanic rocks (Landewednack amphibolites) preserve a pre-emplacement prograde brown amphibole-bearing metamorphic assemblage thought to have formed as newly formed oceanic crust was juxtaposed with newly exhumed hot mantle peridotite. Steep pre-emplacement structures in both the peridotites and Landewednack amphibolites are cut by low-angle mylonitic fabrics thought to have formed during the initial phases of emplacement of mantle over crustal rocks in a partially intra-oceanic setting (∼ 390-375 m.y.). Syn-emplacement magmatism is recorded by intrusions of foliated Kennack gneiss. Anastomosing serpentine-filled faults mark many low-angle contacts between the peridotite and Landewednack amphibolites and appear to represent the final, lowest-T (< 250°C) stages of emplacement (∼ 370 m.y.). [R.A.H.]
Sections:Petrology
Subsections:Igneous petrology
Subjects:Devonian; Dikes; Emplacement; Faults; Folds; Igneous rocks; Intrusions; Mineral composition; Paleozoic; Tectonics; Cornwall England; Devon England; England; Europe; Great Britain; United Kingdom; Western Europe; Lizard Complex; Southwestern England
Abstract Numbers:02M/3451
Record ID:2002045998
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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100 1 |a Cook, C. A.  |e analytic author  |u University of Durham, Department of Geological Sciences, Durham 
245 1 4 |a The emplacement of peridotites and associated oceanic rocks from the Lizard Complex, Southwest England 
300 |a p. 27-45 
500 |a In English. 58 refs. 
500 |a Abstract number: 02M/3451 
500 |a Abstractor: R.A.H. 
500 |a Category Section: Petrology 
500 |a Category Subsection: Igneous petrology 
500 |a Affiliation: University of Durham, Department of Geological Sciences; Durham; GBR; United Kingdom 
500 |a Affiliation: British Geological Survey; ; GBR; United Kingdom 
500 |a Key title: Geological Magazine 
500 |a Source note: Geological Magazine, 139(1), p.27-45. Publisher: Cambridge University Press, London, United Kingdom. ISSN: 0016-7568 
500 |a Publication type: journal article 
504 |b 58 refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom 
520 |a Upper mantle peridotites and associated oceanic rocks from the Lizard complex preserve evidence for a multistage geological history. Steeply dipping pre-emplacement fabrics record high-T (900-1100°C) shearing and exhumation of the mantle peridotites apparently formed during localized rifting in a pull-apart basin setting (∼ 400-390 m.y.). Associated oceanic rocks (Landewednack amphibolites) preserve a pre-emplacement prograde brown amphibole-bearing metamorphic assemblage thought to have formed as newly formed oceanic crust was juxtaposed with newly exhumed hot mantle peridotite. Steep pre-emplacement structures in both the peridotites and Landewednack amphibolites are cut by low-angle mylonitic fabrics thought to have formed during the initial phases of emplacement of mantle over crustal rocks in a partially intra-oceanic setting (∼ 390-375 m.y.). Syn-emplacement magmatism is recorded by intrusions of foliated Kennack gneiss. Anastomosing serpentine-filled faults mark many low-angle contacts between the peridotite and Landewednack amphibolites and appear to represent the final, lowest-T (#LT 250°C) stages of emplacement (∼ 370 m.y.). 
650 7 |a Devonian  |2 georeft 
650 7 |a Dikes  |2 georeft 
650 7 |a Emplacement  |2 georeft 
650 7 |a Faults  |2 georeft 
650 7 |a Folds  |2 georeft 
650 7 |a Igneous rocks  |2 georeft 
650 7 |a Intrusions  |2 georeft 
650 7 |a Mineral composition  |2 georeft 
650 7 |a Paleozoic  |2 georeft 
650 7 |a Tectonics  |2 georeft 
651 7 |a Cornwall England  |2 georeft 
651 7 |a Devon England  |2 georeft 
651 7 |a England  |2 georeft 
651 7 |a Europe  |2 georeft 
651 7 |a Great Britain  |2 georeft 
651 7 |a United Kingdom  |2 georeft 
651 7 |a Western Europe  |2 georeft 
653 |a Lizard Complex 
653 |a Southwestern England 
700 1 |a Holdsworth, R. E.,  |e analytic author 
700 1 |a Styles, M. T.,  |e analytic author 
773 0 |t Geological Magazine  |d London : Cambridge University Press, Jan. 2002  |x 0016-7568  |y GEMGA4  |n Geological Magazine, 139(1), p.27-45. Publisher: Cambridge University Press, London, United Kingdom. ISSN: 0016-7568 Publication type: journal article  |g Vol. 139, no. 1  |h illus., incl. sects., block diags., 1 table, geol. sketch map 
856 |u urn:doi: 10.1017/S0016756801005933