Conventional and ion-microprobe U-Pb dating of detrital zircons of the Tentud�a Group (Serie Negra, SW Spain): implications for zircon systematics, stratigraphy, tectonics and the Precambrian/Cambrian boundary
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Abstract Provenance studies from Cambro‐Ordovician sediments of the North Gondwana passive margin typically ascribe a North African source, a conclusion that cannot be reconciled with all observations. We present new U‐Pb ages from detrital rutile and zircon from Late Ordovician sediments from Saxo‐Thuringia, Germany. Detrital zircons yield age populations of 500–800 Ma, 900–1050 Ma and 1800–2600 Ma. The detrital rutile age spectra are unimodal with ages between 500 and 650 Ma and likely represent, together with the 500–800 Ma and 1800–2600 Ma zircon populations, detritus sourced predominantly from North Africa. In contrast, the c . 950 Ma zircons, which are persistently found in Cambro‐Ordovician sediments of North Gondwana, have no obvious African source. We propose that these zircons are sourced from the Rayner Complex–Eastern Ghats regions of Antarctica and India. An Indo‐Antarctic source indicates either continental‐scale sedimentary transport from central Gondwana to its peripheries or multiple cycles of sediment reworking and redeposition.
Detritus
Continental Margin
Passive margin
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Orogeny
Supercontinent
Rodinia
Apparent polar wander
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The stratigraphy and evolution of the plant-bearing horizions of the extra-peninsular region are reviewed and their similarities and differences with typical peninsular Gondwana are discussed to assess the problem of concepts, limits and extension of Gondwana in this region. It is inferred that the Lesser Himalayan sequence represents continuation of the peninsular Gondwana Sequence, while that of Tethyan Himalayan region departs from typical mainland Gondwana in sedimentation, flora and geological set up. Thus the use of the informal stratigraphic term Gondwana Sequence for this belt is not justificable. However, the use of the term in palaeogeographic sense, which is widely used appears to be appropriate; for which the term ‘Peri-Gondwana’ has already been suggested. The evolution of floral beds may be related to the major tectonic events, the imprints of which are well documented in the Tethyan belt.
Sequence (biology)
Sequence Stratigraphy
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