Goldilocks at the dawn of complex life: mountains might have damaged Ediacaran–Cambrian ecosystems and prompted an early Cambrian greenhouse world

The effects of mountain belts in supporting the conditions for the development of complex life forms in adjacent basins are warmly debated today. In this paper, MOBILE Project researchers show that, while mountains might provide oxygen and nutrients, if a sea basin becomes surrounded by mountains and completely restricted, this effect might become damaging toContinuar lendo “Goldilocks at the dawn of complex life: mountains might have damaged Ediacaran–Cambrian ecosystems and prompted an early Cambrian greenhouse world”

Where are these incredible landscapes?/ Onde ficam essas paisagens incríveis?

(English below) Por mais que pareçam familiares, as imagens são de locais onde ser humano algum jamais pisou. Tratam-se de mosaicos realizados em resolução 4k de fotos tiradas pelos rovers de exploração de Marte. O rover Curiosity, que explora atualmente a superfície do planeta, tem dentre diversos instrumentos científicos um espectrômetro do tipo quadrupolo, doContinuar lendo “Where are these incredible landscapes?/ Onde ficam essas paisagens incríveis?”

MAGMATIC BARCODES HELP TO RECONSTRUCT ANCIENT SUPERCONTINENTS! / CÓDIGO DE BARRAS MAGMÁTICO AJUDA A RECONSTRUIR ANTIGOS SUPERCONTINENTES!

In this new article, the results of a study of high spatial precision dating using ionic microprobe of dykes of the southern São Francisco craton are presented. Mafic dykes are very important as they are excellent temporal and spatial markers of magmatic, tectonic and basin opening events. They usually form swarms of defined orientation thatContinuar lendo “MAGMATIC BARCODES HELP TO RECONSTRUCT ANCIENT SUPERCONTINENTS! / CÓDIGO DE BARRAS MAGMÁTICO AJUDA A RECONSTRUIR ANTIGOS SUPERCONTINENTES!”

PILLOW LAVAS, BLUESCHISTS AND OTHER ANCIENT OCEANIC ROCKS / LAVAS EM ALMOFADA, XISTOS AZUIS E OUTRAS ROCHAS OCEÂNICAS ANTIGAS

Angel Island, San Francisco Bay, is one of the most geologically interesting places, with pilllow basalts, blueschists and serpentinites and wackes. These rocks have been scraped from the subducting plate and represent remnants of a Jurassic oceanic crust, now completely tectonically mixed, in what is called mélange (mixture in French). The Franciscan mélange was formedContinuar lendo “PILLOW LAVAS, BLUESCHISTS AND OTHER ANCIENT OCEANIC ROCKS / LAVAS EM ALMOFADA, XISTOS AZUIS E OUTRAS ROCHAS OCEÂNICAS ANTIGAS”

Microbes influence the formation of iron deposits and can be used in energy fuel cells / Micróbios influenciam na formação de depósitos de ferro e podem ser usados em células de geração de energia

Banded Iron Formations are characteristic iron-rich rocks. The deposition of these rocks occured in specific time intervals in Earth history, such as during the first Great Oxygenation Event (GOE) at ca. 2.4-2.2 billion years ago and after the Neoproterozoic Snowball Earth glaciations (Rapitan-type iron formations). A number of factors seem to have been interconnected inContinuar lendo “Microbes influence the formation of iron deposits and can be used in energy fuel cells / Micróbios influenciam na formação de depósitos de ferro e podem ser usados em células de geração de energia”

THE AGE OF MOUNTAINS AND CONTINENTS FROM TINY MINERALS /A IDADE DAS MONTANHAS E DOS CONTINENTES EM PEQUENOS MINERAIS

Some minerals found in rocks are special in that they accommodate a lot of specific chemical elements in their structures and almost none of other elements. This is the case of zircon (ZrSiO4), which likes Uranium but allow almost no Lead in it’s structure. This turns zircon in an ideal mineral to calculate the ageContinuar lendo “THE AGE OF MOUNTAINS AND CONTINENTS FROM TINY MINERALS /A IDADE DAS MONTANHAS E DOS CONTINENTES EM PEQUENOS MINERAIS”

Stromatolites, the oldest living fossils, part 2: Lagoa Salgada, Rio de Janeiro, Brazil / Estromatólitos, os mais velhos fósseis vivos, parte 2: Lagoa Salgada

Another place where we can find recent stromatolites, Earth’s oldest living fossils (see last post for more info) is at Lagoa Salgada, Rio de Janeiro, Brazil. The pools are for salt evaporation and exploration. Thanks @samyrvq for the very cool pics! Outro local onde podemos encontrar estromatólitos recentes, os fósseis vivos mais antigos da TerraContinuar lendo “Stromatolites, the oldest living fossils, part 2: Lagoa Salgada, Rio de Janeiro, Brazil / Estromatólitos, os mais velhos fósseis vivos, parte 2: Lagoa Salgada”

Stromatolites, the oldest living fossils – part 1: Shark Bay, Australia / Estromatólitos, os mais velhos fósseis vivos, parte 1: Shark Bay

Stromatolites are the oldest known evidence of life, dating back to more than 3.5 billion years ago. They are formed by colonies of cyanobacteria that trap mostly calcareous sediments in column-shaped structures. Nowadays they only occur in places with high salinity where animals that mess up the ocean floor in search of food (the seagrazers)Continuar lendo “Stromatolites, the oldest living fossils – part 1: Shark Bay, Australia / Estromatólitos, os mais velhos fósseis vivos, parte 1: Shark Bay”

Graphite deposits, burial of organic carbon and the first appearance of complex life forms / Depósitos de grafita, soterramento de carbono orgânico e a primeira aparição das formas de vida complexas

Graphite is a natural form of carbon crystallized under lower pressures and temperatures than those needed to stabilize diamond. It is a very important mineral resource with applications in the steel industry, as a lubricant, in refractories, paints, oven and brake linings, brushes, batteries, electrodes, pencils, explosives, magnetic tapes, fertilizers and in the making ofContinuar lendo “Graphite deposits, burial of organic carbon and the first appearance of complex life forms / Depósitos de grafita, soterramento de carbono orgânico e a primeira aparição das formas de vida complexas”