How are Big Data and Blockchain related apart from Blockchain generates Big Data..
It can give a full control over your personal information. A blockchain can recognize you and give you proper level permission (or not). Similar to
chmod. A person can see what and how his data are used and by who.
If you can think about Facebook for example, let's imagine if you could be allowed to see what FB collected about you and what your personal information is used for, or how deep FB is profiling its users.
None of this is what a blockchain can do, they are capabilities of the system placed around a blockchain. The same as any other data storage system. A blockchain can only provide a store and audit trail of itself.
A blockchain does not generate "big data", to say so is to misunderstand both technologies. Blockchains store data, on a scale magnitudes smaller than used big data, and is fundamentally structured again unlike big data. Big data is about analysis of large volumes of unstructured data for behavioral and predictive analytics. Simply tracking transactions back and forth is not such data.