Карта комплексов долеритовых даек России Dolerite Dyke Swarm Map of Russia R E. Ernst & K.L. Buchan.

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Карта комплексов долеритовых даек России Dolerite Dyke Swarm Map of Russia R E. Ernst & K.L. Buchan

Importance of Regional/National Dyke Swarm Maps: interpreting geodynamic settings large igneous provinces (LIPs) locating mantle plumes Ni-Cu-PGE ore deposits breakup history of supercontinents paleocontinental reconstructions

Современный взгляд на дайковые рои. В недавние годы произошла революция в изучении и понимании дайковых роёв. Аэромагнитные карты показывают наличие роёв, отличающихся крупными масштабами, но простой геометрии (линейных или расходящихся веером).Они обычно могут быть датированы с точностью лучше +/-5 млн. лет используя U-Pb метод по минералам бадделеит и циркон и в некоторых случаях с помощью Ar-Ar метода. Датирование указывает, что многие рои внедрились за короткий промежуток времени, <10 млн лет. Палеомагнитные исследования точно датированных даек хорошо обоснованные ТКДП и палеоконтинентальные реконструкции.

In Canada

On Canada Map 453 swarms 35 Archean 76 Paleoproterozoic 60 Mesoproteroizc 31 Neoproterozoic 162 Phanerozoic 89 poorly dated 47 giant swarms (>300 km long) 6 >1000 km long 10 radiating (mantle plume)

In Russia

Possible LIP with radiating swarm Link with Dovyren intrusion? LIP age Ma If 723 Ma, then link with Franklin event northern Canada !!!!! Gladkochub et al., 2007

On Canada Map 453 swarms 35 Archean 76 Paleoproterozoic 60 Mesoproteroizc 31 Neoproterozoic 162 Phanerozoic 89 poorly dated 47 giant swarms (>300 km long) 6 >1000 km long 10 radiating (mantle plume) On Russian Map 700 swarms >200 Precambrian >500 Phanerozoic 100 giant swarms (>300 km long) 10 >1000 km long 20 radiating (mantle plume)