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New Mg isotope data on Holocene hydromagnesite, modern lake and river waters from the Dujiali Lake, central Qinghai-Tibetan Plateau.• A thermodynamic-based box model simulates the behavior of the carbonate system Mg/Ca ratios and Mg isotopes during the evolution of the lake chemistry.• Low-Mg carbonate precipitation may be a common precursor process for driving hydromagnesite precipitation in evaporative lacustrine environments.

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We report an all-fiber telecom-band energy-time entangled biphoton source with all physical elements integrated into a compact cabinet. At a pump power of 800 μW, the photon pairs generation rate reaches 6.9 MHz with the coincidence-toaccidental ratio (CAR) better than 1150. The long-term stability of the biphoton source is characterized by measuring the Hong-Ou-Mandel interference visibility and CAR within a continuous operation period of more than 10 h. Benefiting from the advantages of compact size, light weight, and high stability, this device provides a convenient resource for various field turnkey quantum communication and metrology applications.