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Early Jurassic Earth System and Timescale scientific drilling project (JET) – Operational Report & Explanatory Notes

Authors

JET Scientific Team, 
ICDP Operational Report, ICDP, External Organizations;

Hesselbo,  S.P.
ICDP Operational Report, ICDP, External Organizations;

Ullmann,  C.V.
ICDP Operational Report, ICDP, External Organizations;

Silva,  R.F.L.
ICDP Operational Report, ICDP, External Organizations;

Dalby,  C.J.
ICDP Operational Report, ICDP, External Organizations;

/persons/resource/katjah

Heeschen,  Katja
ICDP Operational Report, ICDP, External Organizations;
4.2 Geomechanics and Scientific Drilling, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Wonik,  T.
ICDP Operational Report, ICDP, External Organizations;

External Ressource

https://doi.org/10.5194/sd-32-1-2023
(Supplementary material)

https://doi.org/10.5880/ICDP.5065.001
(Supplementary material)

Fulltext (public)

JET_OperationalReport_Final.pdf
(Publisher version), 3MB

Supplementary Material (public)
There is no public supplementary material available
Citation

JET Scientific Team, Hesselbo, S., Ullmann, C., Silva, R., Dalby, C., Heeschen, K., Wonik, T. (2023): Early Jurassic Earth System and Timescale scientific drilling project (JET) – Operational Report & Explanatory Notes, (ICDP Operational Report), Potsdam : GFZ German Research Centre for Geosciences, 42 p.
https://doi.org/10.48440/ICDP.5065.001


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5023980
Abstract
This report documents the drilling operations of the Early Jurassic Earth System and Timescale scientific drilling project (JET, ICDP Project: 5065). The wells 5065_1_A, 5065_1_B, 5065_1_A were drilled in 2019-2021 with the support of the International Continental Scientific Drilling Program (ICDP) and the UK Natural Environment Research Council (NERC). Alternatively, the site is known as Prees 2 (Holes A – C). Prees 1 was a nearby hydrocarbon exploration well drilled by Trend Petroleum in 1972–1973. The project aims to construct a fully integrated and astronomically calibrated timescale for the Early Jurassic, a time in Earth history during which important physical, chemical, and biological elements of the modern Earth system were initiated. The JET drilling campaign supplements the earlier Llanbedr (Mochras Farm) borehole (1967 – 1969) in NW Wales – usually known as Mo-chras – which recovered a 1.3 km thick succession comprising the Rhaetian (Upper Triassic), Hettangian, Sinemurian, Pliensbachian and Toarcian (Lower Jurassic) stages (Woodland, 1971; Hesselbo et al., 2013). Using the combined framework of Prees and Mochras, internal and ex-ternal forcing factors on the Earth system will be documented and quantified for major palaeo-environmental events, such as the Late Triassic mass extinction and the Early Toarcian Oceanic Anoxic Event, and for the more stable ‘background’ state.