Scientists have made a groundbreaking discovery in China, revealing a massive impact crater that challenges our understanding of ancient extraterrestrial impacts. The Jinlin crater, located in Zhaoqing, Guangdong Province, is an extraordinary find, offering a rare glimpse into the cosmic forces that have shaped our planet over time.
This crater, uncovered by researchers from Shanghai and Guangzhou, is remarkably well-preserved within the area's thick granite crust. Its discovery has sparked excitement among scientists, as it provides valuable insights into the impact of space rocks on Earth. The site's proximity to the soil erosion measurements indicates that the impact occurred around 11,700 years ago, during the early-to-mid Holocene, marking the end of the last ice age.
What sets Jinlin apart is its immense size. Before this discovery, the largest known Holocene impact structure was the Macha crater in Russia, measuring 300 meters in diameter. However, Jinlin dwarfs this with an astonishing 900 meters, three times the size of Macha. Lead author Ming Chen, from the Center for High Pressure Science and Technology Advanced Research, emphasizes that this discovery highlights the far greater scale of impacts by small extraterrestrial objects during the Holocene than previously recorded.
Despite the object being described as 'small,' the impact crater was over 9 kilometers wide. The researchers believe it was a meteorite rather than a comet and remain uncertain about its composition, whether iron or stone. The region's powerful monsoons, heavy rainfall, and high humidity should have softened the soil and encouraged erosion, but the tough granite layers protected the crater, providing a unique window into this ancient event.
The granite itself holds fascinating secrets. Many quartz deposits around the crater exhibit planar deformation features, a common signature of extraterrestrial impact sites. These features, formed by intense shockwaves, have a pressure range of 10 to 35 gigapascals, which cannot be produced by Earth's geological processes. This discovery highlights the importance of understanding the impact history of small extraterrestrial bodies on our planet.
The Jinlin crater's significance is further emphasized by the statistical likelihood of impact events occurring anywhere on Earth. The site's geological materials, local weather conditions, and water presence all contribute to the degree of erosion. Many impact sites have likely disappeared, but Jinlin's well-preserved nature makes it a valuable record of Earth's impact history.
Chen concludes, "The impact crater is a true record of Earth's impact history. The discovery of the Earth impact crater can provide us with a more objective basis for understanding the distribution, geological evolution, and impact history and regulation of small extraterrestrial bodies." The research paper, 'Jinlin Crater, Guangdong Province, China: Impact Origin Confirmed,' was published in Matter and Radiation at Extremes on November 12, 2025, shedding light on this remarkable find.
