Meenakshi Wadhwa,Timothy J McCoy,Devin L Schrader
Meenakshi Wadhwa
At present, meteorites collected in Antarctica dominate the total number of the world's known meteorites. We focus here on the scientific advances in cosmochemistry and planetary science that have been enabled by access to, and investigatio...
Thorsten Kleine,Richard J Walker
Thorsten Kleine
The short-lived Hf-W isotope system has a wide range of important applications in cosmochemistry and geochemistry. The siderophile behavior of W, combined with the lithophile nature of Hf, makes the system uniquely useful as a chronometer o...
Yong-Guan Zhu,Masafumi Yoshinaga,Fang-Jie Zhao et al.
Yong-Guan Zhu et al.
Arsenic is the most prevalent environmental toxic element and causes health problems throughout the world. The toxicity, mobility, and fate of arsenic in the environment are largely determined by its speciation, and arsenic speciation chang...
E Pierazzo,H J Melosh
E Pierazzo
Natural impacts in which the projectile strikes the target vertically are virtually nonexistent. Nevertheless, our inherent drive to simplify nature often causes us to suppose most impacts are nearly vertical. Recent theoretical, observatio...
Stromatolites in Precambrian carbonates: evolutionary mileposts or environmental dipsticks? [0.03%]
前寒武纪碳酸盐岩中的叠层石：进化里程碑还是环境指示器？
J P Grotzinger,A H Knoll
J P Grotzinger
Stromatolites are attached, lithified sedimentary growth structures, accretionary away from a point or limited surface of initiation. Though the accretion process is commonly regarded to result from the sediment trapping or precipitation-in...
K H Nealson
K H Nealson
The prokaryotes (bacteria) comprise the bulk of the biomass and chemical activity in sediments. They are well suited to their role as sediment chemists, as they are the right size and have the required metabolic versatility to oxidize the o...
C F Chyba,G D McDonald
C F Chyba
J Oró,S L Miller,A Lazcano
J Oró