In this case, the partial melting of rocks of the Shuangqiaoshan Group can produce S-, I- and transitional type granitoids.After strong differentiation it formed tungsten-bearing granitoids characterized by enrichment of high alkali, silicon and volatile components.Yet advocates of wood-burners argue that when used properly — that is, with the door closed — they are cleaner and safer than conventional open fireplaces.Fumes are carried up the chimney, and there’s no chance of a log rolling out of the grate and on to a carpet, creating a potential fire hazard.Part of the appeal lies in their supposed green credentials. That’s because trees absorb the greenhouse gas carbon dioxide from the atmosphere as they grow.Burning wood simply releases this CO2 back into the air — meaning it makes little contribution to global warming.
Two granitoids are characterized by a negative slope with significant light REE/heavy REE fractionation [(La/Yb)) of ~ 1.2–1.3 Ga are consistent, indicating that Neoproterozoic crustal rocks of the Shuangqiaoshan Group could have contributed to form the Yangchuling magmas.
LA-ICPMS zircon U–Pb analyses suggest that of the monzogranitic porphyry and granodiorite were formed at 143.8 ± 0.5 Ma and 149.8 ± 0.6 Ma, respectively.
Six molybdenite samples yielded a Re–Os weighted mean age of 146.4 ± 1.0 Ma.
Some of these blobs of soot, called PM2.5s, are 100 times smaller than the diameter of a human hair and can get deep into our lungs.
They’re so tiny that experts think they may even be able to get through the lungs and into other organs. Can something as ancient and natural as throwing a log on the embers on a winter’s night really be dragging us back to the bad old days of ‘pea soupers’ and respiratory disease? UK air quality is now so bad that many cities and towns routinely fail to meet international standards.