Confess
发表于 2025-3-28 17:07:06
Geophysics and Petrophysics of the Popigai Impact Structure, Siberia,s overlying Archean crystalline basement. The structure is characterized by a gravity anomaly low of −35 mGal amplitude, one of the largest magnitude gravity anomalies associated with a terrestrial impact structure. Superimposed on the gravity low is a concentric ring-shaped high, ~45 km in diameter
朦胧
发表于 2025-3-28 21:18:50
U-Pb Analyses of Zircons from the Popigai Impact Structure, Russia: First Results,ted in ages of 1982 Ma for two of the zircons and younger ages for the other two grains. Minimum age estimates of the younger grains can be derived from their 912 and 306 Ma .Pb / .Pb ages. No shock features are obvious in these grains; thus, the Pb loss could be recent. The older ages represent age
amphibian
发表于 2025-3-28 22:53:58
Impact-Generated Hydrothermal Systems: Data from Popigai, Kara, and Puchezh-Katunki Impact Structurssian impact structures — Popigai (diameter: 100 km), Kara (65 km), and Puchezh-Katunki (80 km). The dominant hydrothermal assemblages at all craters are clay minerals (smectites, chlorites, and mixed-layered smectites-chlorites), various zeolites, calcite, and pyrite; in addition, cristobalite, qua
TEM
发表于 2025-3-29 06:01:06
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flimsy
发表于 2025-3-29 10:27:29
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食道
发表于 2025-3-29 12:38:04
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LATE
发表于 2025-3-29 18:14:32
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Dictation
发表于 2025-3-29 22:17:02
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PATHY
发表于 2025-3-30 03:38:47
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Notorious
发表于 2025-3-30 05:41:32
,Seismic Correlation of the Mjølnir Marine Impact Crater to Shallow Boreholes,f the crater and another ~30 km outside the crater periphery. This correlation provides a detailed seismic stratigraphy for the impact-related deposits and post-impact strata. The biostratigraphic 142 ± 2.6 Ma age for the event determined earlier at the base of the post-impact succession should be c