Detrital zircon U-Pb ages from the Lower Jurassic of the Llanbedr (Mochras Farm) borehole, Wales

The dataset contains detrital zircon U-Pb ages for the Llanbedr (Mochras Farm) borehole, from the Lower Jurassic. The U-Pb zircon age analyses was carried out on the SHRIMP IIe/MC instrument (the sensitive high resolution ion microprobe) at the Polish Geological Institute, Warsaw. Data relate to the Llanbedr (Mochras Farm) Borehole drilled in 1967-1969 near the village of Llanbedr, NW Wales, SH 5533 2594. The aim for generating these data was to provide evidence for sediment provenance to the Llanbedr (Mochras Farm) site during the Early Jurassic. Publication in press, Jiang et al. (2026) Laurasian Seaway history during the Early Jurassic from quantitative mineralogy and detrital zircon dating. Paleoceanography and Paleoclimatology.

Date (Creation): 2026-05-08

Citation identifier: http://data.bgs.ac.uk/id/dataHolding/13608700

Point of contact

Organisation name	Individual name	Electronic mail address	Role
University of Exeter	Stephen Hesselbo	not available	Originator
University of Exeter	Mengjie Jiang	not available	Originator
University of Exeter	Dr Clemens V Ullmann	not available	Originator
Polish Geological Institute	G Pieńkowski	not available	Originator
Polish Geological Institute	E Krzemińska	not available	Originator
Jagiellonian University	A Uchman	not available	Originator
Jagiellonian University	D Salata	not available	Originator
British Geological Survey	Enquiries	enquiries@bgs.ac.uk	Distributor
British Geological Survey	Enquiries	enquiries@bgs.ac.uk	Originator
British Geological Survey	Enquiries	not available	Distributor
British Geological Survey	Enquiries	not available	Point of contact

Maintenance and update frequency: notApplicable

GEMET - INSPIRE themes, version 1.0

Geology

BGS Thesaurus of Geosciences

Detrital minerals
Uranium thorium lead dating
Jurassic
Radiometric dating

dataCentre

Keywords

NERC_DDC

Access constraints: Other restrictions

Other constraints: licenceOGL

Other constraints: Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"

Use constraints: Other restrictions

Other constraints: The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.

Other constraints: Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"

Spatial representation type: Vector

Language: English

Topic category

Geoscientific information

Geographic identifier: Mochras [id=1363361]
British Geological Survey Gazetteer: OS gazetteer 2002 revision

Begin date: 2019-01-01

End date: 2023-01-01

Unique resource identifier: OSGB 1936 / British National Grid (EPSG::27700)

Distribution format

Name	Version
MS Excel

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
British Geological Survey	Enquiries	enquiries@bgs.ac.uk	Distributor

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
British Geological Survey	Enquiries	not available	Distributor

OnLine resource

Protocol	Linkage	Name
WWW:DOWNLOAD-1.0-http--download	https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item192142	Data

OnLine resource

Protocol	Linkage	Name
WWW:LINK-1.0-http--related	https://doi.org/10.5285/386344e4-b0bf-4014-92a3-1f11c0ef2e3a	Citation Information - Digital Object Identifier (DOI)

Hierarchy level: Dataset

Other: dataset

Conformance result

Title: INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology

Date (Publication): 2011

Explanation: See the referenced specification

Pass: No

Conformance result

Title: Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services

Date (Publication): 2010-12-08

Explanation: See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF

Pass: No

Statement: The U-Pb zircon age analyses were conducted on the SHRIMP IIe/MC instrument (the sensitive high resolution ion microprobe) at the Polish Geological Institute, Warsaw, using a duoplasmatron as primary ion source. The measurements were performed during two independent cycle-sessions, but according to the same procedure and settings. Secondary ions were collected on a single electron multiplier by cycling the magnet through six scans on nine masses: 196Zr2O, 204Pb, 204.1 (as a background), 206Pb, 207Pb, 208Pb, 238U, 248ThO, and 254UO. Common-Pb corrections for unknown samples were based on measured 204Pb. The isotopic composition was calculated using the Pb isotopic evolution model of Stacey and Kramers (1975), and the time corresponding to the preliminary 206Pb/238U age was calculated using the default common-Pb compositions.