The Dongjun Pb-Zn-Ag deposit in the northern part of the Great Xing'an Range (NE China) consists of quartzsulfide vein-type and breccia-type mineralization, related to granite porphyry. Hydrothermal alteration is well-developed and includes potassic-silicic-sericitic alteration, phyllic alteration and propylitic alteration. Three stages of mineralization are recognized on the basis of field evidence and petrographic observation, demarcated by assemblages of quartz-pyritearsenopyrite (early stage), quartz-polymetallic sulfide (intermediate stage) and quartz-carbonate-pyrite (late stage). Zircon LA-ICP-MS U-Pb dating indicates that the granite porphyry was emplaced at 146.7 ± 1.2 Ma (Late Jurassic). Microthermometry and laser Raman spectroscopy shows that ore minerals were deposited in conditions of intermediate temperatures (175-359°C), low salinity (0.5-9.3 wt% NaCl eqv.) and low density (0.60-0.91 g/cm 3 ). Ore-forming fluids were derived largely from magmatic hydrothermal processes, with late-stage addition of meteoric water, belonging to a H 2 O -NaCl-CO 2 ± CH 4 system. The δ 34 S V-CDT values range from 0.75‰ to 4.

Solvent-and Catalyst-Free Synthesis of 2,3-Dihydro-1H-benzo[d]imidazoles. -A new protocol for the solvent-and catalyst-free synthesis of dihydrobenzimidazoles, dihydrobenzothiazoles, and perimidines from acyclic ketones and diamines is described. -(LI, D.-P.; ZHANG, G.-L.; AN, L.-T.; ZOU*, J.-P.; ZHANG, W.; Green Chem. 13 (2011) 3, 594-597, http://dx.doi.org/10.1039/c0gc00572j ; Key Lab. Org. Synth., Coll. Chem. Chem. Eng., Soochow Univ.,

Manganese(III)-Mediated Direct Phosphonation of Arylalkenes and Arylalkynes.-A Mn(III)-mediated regioselective phosphonation reaction of arylalkenes bearing conjugated groups, such as ketone, amide, nitro, or ester at the α-position is described. The transformation can also be used for arylalkynes (IX) to prepare inden-1-one derivatives (X). -(PAN, X.-Q.; ZOU, J.-P.; ZHANG, G.-L.; ZHANG*, W.; Chem.

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The green catalyst montmorillonite K10 can be reused three times without considerable loss of activity.