The Huajian gold deposit is one of the largest hydrothermal intrusion-related gold deposits in eastern Hebei Province, located in the northern margin of the North China Craton NCC. The mineralization in this district displays a close spatial association with the shoshonitic Niuxinshan intrusive complex NIC , which contributes to the characterization of the metallogeny associated with convergent margin magmatism. The new geochronological data constrain the timing of the tectonic transformation between and Ma. The other group exhibits flat REE patterns with obvious negative Eu anomalies, higher Yb, lower Sr, and weak NTT anomalies, which indicate an intra-plate extensional environment with a thinning crust.
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Zircons are durable crystals used to date events billions of years ago, but the dating process must be done carefully, according to a study just published in Geology by Aaron Cavosie, a visiting professor of geoscience at the University of Wisconsin-Madison. The deformed lunar zircon at centre, which was returned by Apollo astronauts, was not formed in this rock, which complicates the dating process. The fractures characteristic of meteorite impact are not seen in most lunar zircons, so the ages they record probably reflect heating by molten rock, not impact. Phenomenally durable crystals called zircons are used to date some of the earliest and most dramatic cataclysms of the solar system. One is the super-duty collision that ejected material from Earth to form the Moon roughly 50 million years after Earth formed.
This is an open-access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. No additional external funding was received for this study. There are no patents, products in development or marketed products to declare. Similar interpretations, differing in detail, have been put forward since then, implicating this painting not only as the oldest depiction of a volcanic eruption, but as a contender for being the first graphical representation of a landscape or a map  — .