The workshop
addressed several broad questions that could be profitably addressed in
the Colorado Plateau venue. These include: what are the global or
regional climate trends vs. plate position changes in “hot
house” Pangea? how do largely fluvial systems respond to cyclical
climate? what are the rates and magnitudes of the transition from the
Paleozoic to essentially modern terrestrial ecosystems? and how does
the stratigraphy reflect the interplay between growth in accommodation,
uplift, and eustatic fluctuations? Based on these questions, the
workshop identified goals attainable by coring of key Triassic/Jurassic
sections:
-
Establishment of paleogeographic boundary
conditions, particularly changes in paleolatitude, of western Pangea
during Late Triassic to Late Jurassic time.
-
Development of the highest-resolution, integrated
magnetostratigraphy for Early Triassic through Late Jurassic strata to
facilitate detailed correlation with established chronologies and
climatic cyclicities of the Newark basins of eastern North America and
the Tethyan, Germanic, English, and Chinese marine and continental
sections.
-
Determination of how paleoclimates are expressed
through time in the sedimentary record of western Pangea, including
major climate changes, and testing this high-resolution paleoclimate
record against other parts of Pangea and subsequent fragments
permitting appropriate-scale tests of climate models.
-
Identification of the stratigraphic position of
major global biotic transitions (i.e. Permo-Triassic,
Triassic-Jurassic, and Toarcian extinctions)
-
Refinement of lithostratigraphic and
biostratigraphic correlations, considering regional unconformities and
their possible relationship to proposed eustatic sea-level fluctuations
and tectonic events (c.f., Bachmann and Kozur, 2004).
-
Development of a chemostratigraphic (δ13C, cuticular CO2 proxy, Nd, Sr, clays, etc.) reference sections.
-
Improvement to U-Pb zircon provenance stratigraphy and geochronology of ash beds.
-
Definition of unambiguous links among the
temporal evolution of the Colorado Plateau sedimentary record and
rifting of Pangea, the emplacement of the Siberian, Central Atlantic
Magmatic, and Karoo flood basalt provinces, and possibly the opening of
the Atlantic Ocean.