Application of palynological data to the chronology of the Palaeogene lava fields of the British province: Implications for magmatic stratigraphy

被引:21
作者
Bell, BR [1 ]
Jolley, DW [1 ]
机构
[1] UNIV SHEFFIELD, DEPT EARTH SCI, CTR PALYNOL STUDIES, SHEFFIELD S1 3JD, S YORKSHIRE, ENGLAND
关键词
British Province; Palaeogene; lava fields; palynology; dating;
D O I
10.1144/gsjgs.154.4.0701
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
New high-precision ages, determined from palynomorph assemblages within intercalated sedimentary deposits, are presented for the Palaeogene lava fields (Skye, Mull and Antrim) of the British Province. These data reveal very rapid averaged eruption rates (1 m/200 years) and the non-synchronous formation of the lava fields. Eruption of the volumetrically dominant transitional to mildly alkaline lavas of the Skye (58.25-58.0 Ma) and Mull (post 55 Ma) lava fields (the Skye Main Lava Series, and the Plateau Group of Mull, respectively) is separated by the eruption of the MORB-like Preshal More hows of olivine tholeiite found at the top of the preserved sequence on Skye and at the base of the Mull Lava Field. The Lower Formation of the Antrim Lava Field correlates with the Skye Lava Field and the Upper Formation correlates with the Preshal More flows. The new ages indicate that the eruption of the Preshal More flows was synchronous with the main ocean floor spreading event which occurred 500 km to the NW, at c. 55 Ma, during Chron 24r. A combined thinspot and channelized plume model may best explain the temporal and spatial distributions of the lava fields and associated subvolcanic complexes of the British Province.
引用
收藏
页码:701 / 708
页数:8
相关论文
共 57 条
[1]  
Ali J.R, 1996, GEOLOGICAL SOC SPECI, V101, P129, DOI DOI 10.1144/GSL.SP.1996.101.01.09
[2]  
Anderson F.W., 1966, The geology of northern Skye
[3]  
[Anonymous], 1985, CHRONOLOGY GEOLOGICA, DOI DOI 10.1144/GSL.MEM.1985.010.01.15
[4]  
[Anonymous], 2018, SOCIAL DYSFUNCTION
[5]  
BAILEY EB, 1924, TERTIARY POST TERTIA
[6]   On the origin of a reddened interflow bed within the Palaeocene lava field of north Skye [J].
Bell, BR ;
Williamson, IT ;
Head, FE ;
Jolley, DW .
SCOTTISH JOURNAL OF GEOLOGY, 1996, 32 :117-126
[7]   THE PETROLOGY AND GEOCHEMISTRY OF CONE-SHEETS FROM THE CUILLIN IGNEOUS COMPLEX, ISLE-OF-SKYE - EVIDENCE FOR COMBINED ASSIMILATION AND FRACTIONAL CRYSTALLIZATION DURING LITHOSPHERIC EXTENSION [J].
BELL, BR ;
CLAYDON, RV ;
ROGERS, G .
JOURNAL OF PETROLOGY, 1994, 35 (04) :1055-1094
[8]  
BOULTER M. C., 1989, SPECIAL PAPERS PALAE, V42
[9]   IMPLICATIONS OF MANTLE PLUME STRUCTURE FOR THE EVOLUTION OF FLOOD BASALTS [J].
CAMPBELL, IH ;
GRIFFITHS, RW .
EARTH AND PLANETARY SCIENCE LETTERS, 1990, 99 (1-2) :79-93
[10]   A NEW GEOMAGNETIC POLARITY TIME SCALE FOR THE LATE CRETACEOUS AND CENOZOIC [J].
CANDE, SC ;
KENT, DV .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 1992, 97 (B10) :13917-13951